Perhaps you should try some spelling variations:
doan chien » doanh chien, doan thien, hoan thien
chien soat » thien hoat
hieu hoat » hieu hoa, thien hoat, hieu luat
tinh nang » trinh nang, tin nang, tich nang
suat doan » luat doanh, quan doan, luat dan
van hieu » cao hieu
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 hoat ) or ( tinh nang suat doan chien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung luan van hieu hoat ) OR ( tinh nang suat doan chien soat )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung luan van hieu hoat ) or ( tinh nang suat doan chien soat ))*.