Perhaps you should try some spelling variations:
dung thanh » duong thanh, dong thanh, dang thanh
thanh cac » hanh cac, thanh bac, thanh ca
hieu soat » hieu suat, hieu hoat, hieu luat
van chien » van hieu, van tien
cac hieu » cac chieu, cao hieu, cac kieu
van hien » van hieu, van tien
tin » tinh
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 thanh cac hieu soat ) or ( trinh dung luan ((van chien) or (van hien)) soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung thanh cac hieu soat ) OR ( trinh dung luan ((van chien) OR (van hien)) soat )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung thanh cac hieu soat ) or ( trinh dung luan ((van chien) or (van hien)) soat ))*.