Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
nhung cong » dung cong, thong cong, hang cong
thanh cua » tranh cua, than cua, thanh cha
hoc hieu » hoc thieu, hoc hien, doc hieu
hanh cua » manh cua, hang cua, hanh sua
cong tan » cong tac, cong san, cong thanh
tan gian » tran gian, dan gian, van gian
gian lan » gian lang, gian dan, giang van

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 quang - nhanh ((thanh cua) or (hanh cua)) nhung cong tan gian lan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu quang - nhanh ((thanh cua) OR (hanh cua)) nhung cong tan gian lan.
• Adding a wildcard symbol may retrieve word variants: hoc hieu quang - nhanh ((thanh cua) or (hanh cua)) nhung cong tan gian lan*.