Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
trung cam » trung tam, trung nam, trung ca
trung cap » truong cao, trung tam
doi hieu » doi chieu, doc hieu, doi hien
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
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: doi hieu lang - thanh ((trung cam) or (trung cap)) nhung cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - thanh ((trung cam) OR (trung cap)) nhung cong dan than cau*.