Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
cong luan » tong luan, cong tuan, dong luan
luan phan » luan van, luan hoan
doc hieu » toc thieu, hoc thieu, hoc hien
danh qua » hanh qua, doanh quan, manh quan
dan quan » van quan, ban quan, dan luan
phan lap » phan dau

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 lang - hanh ((danh qua) or (dan quan)) dung cong luan phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - hanh ((danh qua) OR (dan quan)) dung cong luan phan lap.
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - hanh ((danh qua) or (dan quan)) dung cong luan phan lap*.