Perhaps you should try some spelling variations:
nhanh thang » nhanh thanh, nhanh quang, hanh trang
nhanh lang » nhanh quang, nhan dang, nhanh dong
hieu lang » chieu sang, hieu quang, nhieu tang
doi hieu » doi chieu, doc hieu, doi hien
cua dung » cua dong, qua dung, cua rung
cua dang » cua cong, cua ban
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - ((nhanh lang) OR (nhanh thang)) ((cua dung) OR (cua dang)) cong dan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi hieu lang - ((nhanh lang) or (nhanh thang)) ((cua dung) OR (cua dang)) cong dan toan cao~".
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - ((nhanh lang) or (nhanh thang)) ((cua dung) OR (cua dang)) cong dan toan cao*.