Perhaps you should try some spelling variations:
chien toan » thien toan, chien tranh, chien thang
hieu soat » hieu suat, hieu hoat, hieu luat
quang uan » quang tuan, quang ban, quang tran
van chien » van hien, van tien
van hieu » cao hieu
uan van » quan van, tan van, san van
luan » quan, lan

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

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