Perhaps you should try some spelling variations:
minh quang » tinh quang, dinh quang, minh hoang
tranh hang » tran hoang, tran hong
hieu sang » chieu sang, hieu lang, hieu quang
trinh han » trinh quan
doc hieu » toc thieu, hoc thieu, hoc hien
cong tac » cong ty
tac luan » tac quan, tao luan, tang luan

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 sang - minh quang ((tranh hang) or (trinh han)) cong tac luan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - minh quang ((tranh hang) OR (trinh han)) cong tac luan van.
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - minh quang ((tranh hang) or (trinh han)) cong tac luan van*.