Perhaps you should try some spelling variations:
trinh duong » trinh dung, trinh phuong, dinh duong
chien soat » thien hoat
van chien » van hien, van hieu, van tien
hieu soat » hieu hoat, hieu luat, kiem soat
hieu suat » hieu luat, hieu qua
dung lan » dung luan, dung land, dung lam
lan van » luan van, lang van, tan van
qua van » quan van, qua ban, qua san
tin » tinh

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 lan van chien soat ) or ( trinh duong qua van ((hieu soat) or (hieu suat)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung lan van chien soat ) OR ( trinh duong qua van ((hieu soat) OR (hieu suat)) )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung lan van chien soat ) or ( trinh duong qua van ((hieu soat) or (hieu suat)) ))*.