Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
tam dung » tam duong, tac dung, tan dung
cong dan » cong san, cong tan, huong dan
than cap » thanh lap, thanh cac, than cua
khan cap » khan ap, khoan cam, phan cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu lang - thanh trung tam dung cong dan ((than cap) or (khan cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - thanh trung tam dung cong dan ((than cap) OR (khan cap)).
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - thanh trung tam dung cong dan ((than cap) or (khan cap))*.