Perhaps you should try some spelling variations:
tinh luong » tinh huong, dinh luong, minh luong
luong luan » luong quan, luong xuan, cuong luan
quang tang » quang thang, quang dang, quang tung
chien toan » thien toan, chien tranh, chien thang
hieu soat » hieu suat, hieu hoat, hieu luat
van chien » van hien, van tien
van hieu » cao hieu
tang van » dang van, hoang van, trong van

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tinh luong luan van hieu soat ) or ( tinh quang tang van chien toan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh luong luan van hieu soat ) OR ( tinh quang tang van chien toan )).
• Adding a wildcard symbol may retrieve word variants: (( tinh luong luan van hieu soat ) or ( tinh quang tang van chien toan ))*.