Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
trung vap » trung va, trung van, trung lap
trung cap » truong cao, trung tam
hoc hieu » hoc thieu, hoc hien, doc hieu
cong dan » cong san, cong tan, huong dan
dan chan » dan gian, dan ca, van chat
chan cap » khan cap, than cap, cao cap

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

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