diff --git a/changelog.md b/changelog.md
index cb8d130..8d6cd23 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## 2025-04-22 - 5.11.4 - fix(search)
+Implement implicit AND logic for mixed simple term and field:value queries in search
+
+- Added a new branch to detect and handle search queries that mix field:value pairs with plain terms without explicit operators
+- Builds an implicit $and filter when query parts contain colon(s) but lack explicit boolean operators or quotes
+- Ensures proper parsing and improved robustness of search filters
+
 ## 2025-04-22 - 5.11.3 - fix(lucene adapter and search tests)
 Improve range query parsing in Lucene adapter and expand search test coverage
 
diff --git a/ts/00_commitinfo_data.ts b/ts/00_commitinfo_data.ts
index 4bdda03..1431345 100644
--- a/ts/00_commitinfo_data.ts
+++ b/ts/00_commitinfo_data.ts
@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/smartdata',
-  version: '5.11.3',
+  version: '5.11.4',
   description: 'An advanced library for NoSQL data organization and manipulation using TypeScript with support for MongoDB, data validation, collections, and custom data types.'
 }
diff --git a/ts/classes.doc.ts b/ts/classes.doc.ts
index 7bae955..178ade6 100644
--- a/ts/classes.doc.ts
+++ b/ts/classes.doc.ts
@@ -379,6 +379,34 @@ export class SmartDataDbDoc<T extends TImplements, TImplements, TManager extends
       const orConds = searchableFields.map((f) => ({ [f]: { $regex: pattern, $options: 'i' } }));
       return await (this as any).getInstances({ $or: orConds });
     }
+    // implicit AND for mixed simple term + field:value queries (no explicit operators)
+    const parts = q.split(/\s+/);
+    const hasColon = parts.some((t) => t.includes(':'));
+    // implicit AND for mixed simple term + field:value queries (no explicit operators or range syntax)
+    if (
+      parts.length > 1 && hasColon &&
+      !q.includes(' AND ') && !q.includes(' OR ') && !q.includes(' NOT ') &&
+      !q.includes('(') && !q.includes(')') && !q.includes('[') && !q.includes(']') &&
+      !q.includes('"') && !q.includes("'") &&
+      !q.includes('*') && !q.includes('?')
+    ) {
+      const andConds = parts.map((term) => {
+        const m = term.match(/^(\\w+):([^"'\\*\\?\\s]+)$/);
+        if (m) {
+          const field = m[1];
+          const value = m[2];
+          if (!searchableFields.includes(field)) {
+            throw new Error(`Field '${field}' is not searchable for class ${this.name}`);
+          }
+          return { [field]: value };
+        } else {
+          const esc = escapeForRegex(term);
+          const ors = searchableFields.map((f) => ({ [f]: { $regex: esc, $options: 'i' } }));
+          return { $or: ors };
+        }
+      });
+      return await (this as any).getInstances({ $and: andConds });
+    }
     // detect advanced Lucene syntax: field:value, wildcards, boolean, grouping
     const luceneSyntax = /(\w+:[^\s]+)|\*|\?|\bAND\b|\bOR\b|\bNOT\b|\(|\)/;
     if (luceneSyntax.test(q)) {