fixed

Sieve/Services/SieveProcessor.cs

@@ -208,7 +208,8 @@ namespace Sieve.Services
 
                             if (!string.IsNullOrEmpty(searchProperty))
                             {
-                                dynamicQuery = GetDynamicQueryString(filterTerm, searchProperty.ToString(), filterValue.ToString());
+                                var data = RemoveSignAndLowerCase4VietnameseString(filterValue.ToString());
+                                dynamicQuery = GetDynamicQueryString(filterTerm, searchProperty.ToString(), data);
                                 if (string.IsNullOrEmpty(fullQueryString))
                                 {
                                     searchPart = "(" + dynamicQuery + ")";
@@ -501,9 +502,9 @@ namespace Sieve.Services
                 case FilterOperator.LessThanOrEqualTo:
                     return sResult + "<=" + value;
                 case FilterOperator.Contains:
-                    return sResult + ".Contains(" + RemoveSignAndLowerCase4VietnameseString(value) + ")";
+                    return sResult + ".Contains(" + value + ")";
                 case FilterOperator.StartsWith:
-                    return sResult + ".Contains(" + RemoveSignAndLowerCase4VietnameseString(value) + ")";
+                    return sResult + ".Contains(" + value + ")";
                 default:
                     return sResult + "=" + value;
             }