Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
cong dang » cong dong, cong dan, cong dung
trung ha » trung hoc, trung cap
hanh cau » nhanh cau, hanh cac, hanh cat
hang cau » hang dau, hang ca, nhung cau
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - thanh ((trung tam) or (trung ha)) nhung cong dang ((hanh cau) OR (hang cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - thanh ((trung tam) OR (trung ha)) nhung cong dang ((hanh cau) OR (hang cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - thanh ((trung tam) or (trung ha)) nhung cong dang ((hanh cau) OR (hang cau))".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - thanh ((trung tam) or (trung ha)) nhung cong dang ((hanh cau) OR (hang cau))*.