diff --git a/search_string.go b/search_string.go
new file mode 100644
index 0000000..5015bad
--- /dev/null
+++ b/search_string.go
@@ -0,0 +1,37 @@
+package mongodb
+
+import (
+	"regexp"
+	"strings"
+	"unicode"
+
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/x/bsonx"
+	"golang.org/x/text/runes"
+	"golang.org/x/text/transform"
+	"golang.org/x/text/unicode/norm"
+)
+
+// GenerateQuerySearchString ...
+func GenerateQuerySearchString(s string) bson.M {
+	return bson.M{
+		"$regex": bsonx.Regex(NonAccentVietnamese(s), "i"),
+	}
+}
+
+// NonAccentVietnamese ...
+func NonAccentVietnamese(str string) string {
+	str = strings.ToLower(str)
+	str = replaceStringWithRegex(str, `đ`, "d")
+	t := transform.Chain(norm.NFD, runes.Remove(runes.In(unicode.Mn)), norm.NFC)
+	result, _, _ := transform.String(t, str)
+	result = replaceStringWithRegex(result, `[^a-zA-Z0-9\s]`, "")
+
+	return result
+}
+
+// replaceStringWithRegex ...
+func replaceStringWithRegex(src string, regex string, replaceText string) string {
+	reg := regexp.MustCompile(regex)
+	return reg.ReplaceAllString(src, replaceText)
+}