Perhaps you should try some spelling variations:
hieu tinh » chieu tinh, lieu tinh, kieu tinh
manh hung » anh huong
hung chua » cung chua, hung chu, chung chuan
chua nang » chuc nang, chua xang, kha nang
doc hieu » toc thieu, hoc thieu, hoc hien
cong van » cong vang, song van, cong tan
cong san » cong tac
luan ban » luan van, luan san, luan han

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu tinh - manh hung chua nang ((cong van) or (cong san)) luan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tinh - manh hung chua nang ((cong van) OR (cong san)) luan ban.
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - manh hung chua nang ((cong van) or (cong san)) luan ban*.