Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
tran manh » tran minh, tran thanh, tran dinh
hung cong » nhung cong, hung cuong, phung cong
hoc hieu » hoc thieu, hoc hien, doc hieu
tran van » luan van
ban than » ban thanh, van thanh, ban hanh
ban hang » ngan hang

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 - hanh ((tran manh) OR (tran van)) hung cong ((ban than) or (ban hang)) man~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu quang - hanh ((tran manh) OR (tran van)) hung cong ((ban than) OR (ban hang)) man.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu quang - hanh ((tran manh) OR (tran van)) hung cong ((ban than) or (ban hang)) man".
• Adding a wildcard symbol may retrieve word variants: hoc hieu quang - hanh ((tran manh) OR (tran van)) hung cong ((ban than) or (ban hang)) man*.