diff --git a/apps/cron/src/services/PostService/index.mts b/apps/cron/src/services/PostService/index.mts
index c1cec853..2be0053f 100644
--- a/apps/cron/src/services/PostService/index.mts
+++ b/apps/cron/src/services/PostService/index.mts
@@ -179,11 +179,18 @@ export class PostService implements Service {
   ): Promise<{ isSpam: boolean; reason: string }> {
     const includesCN = /[\u4e00-\u9fa5]/.test(text)
     const includesKR = /[ㄱ-ㅎ|ㅏ-ㅣ|가-힣]/.test(text)
+    const includesVN = /[àáâãèéêìíòóôõùúýăđĩũơưạảấầẩẫậắằẳẵặẹẻẽếềểễệỉịọỏốồổỗộớờởỡợụủứừửữựỳỵỷỹ]/.test(
+      text,
+    )
 
     if (includesCN && !includesKR) {
       return { isSpam: true, reason: 'includesCN' }
     }
 
+    if (includesVN && !includesKR) {
+      return { isSpam: true, reason: 'includesVN' }
+    }
+
     let replaced = text.replace(/```([\s\S]*?)```/g, '') // remove code blocks
     // replace image markdown
     replaced = replaced.replace(/!\[([\s\S]*?)\]\(([\s\S]*?)\)/g, '')