Perhaps you should try some spelling variations:
nang truong » tang truong, quang truong, nang luong
truong quan » trong quan, thong quan, luong quan
quan trong » gian trong
hieu lang » chieu sang, hieu quang, nhieu tang
hop hieu » hop nhieu, hoi hieu, hoc thieu
cong dan » cong san, cong tan, huong dan
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hop hieu lang - nang truong quan trong cong dan ((than cau) or (phan tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hop hieu lang - nang truong quan trong cong dan ((than cau) OR (phan tu))*.