Perhaps you should try some spelling variations:
quang hanh » quang thanh, quang khanh, quan hanh
quang manh » quang minh, quang anh, quang thanh
quang tran » quang tuan, quang trung, quang thanh
bien soan » bien so
hieu luat » hieu qua
tran van » luan van
van hieu » cao hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( trinh dung ((quang hanh) or (quang manh)) bien soan ) or ( tinh quang tran van hieu luat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh dung ((quang hanh) OR (quang manh)) bien soan ) OR ( tinh quang tran van hieu luat )).
• Adding a wildcard symbol may retrieve word variants: (( trinh dung ((quang hanh) or (quang manh)) bien soan ) or ( tinh quang tran van hieu luat ))*.