Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu lang » chieu sang, hieu quang, nhieu tang
doi hieu » doi chieu, doc hieu, doi hien
trung va » truong va, trang va, trung ha
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
toan cao » toan ban
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi hieu lang - thanh trung va nhung ((cong dan) or (cong tan)) ((toan cao) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - thanh trung va nhung ((cong dan) OR (cong tan)) ((toan cao) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - thanh trung va nhung ((cong dan) or (cong tan)) ((toan cao) or (toan tap))*.