Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
tien thanh » tien thinh, tran thanh, den thanh
nang cong » nang song, dang cong, bang cong
tranh va » tranh van, trang va, trinh va
san toan » dan toan, manh toan, xuan toan
van toan » van tuan, van tan, van thanh
va nang » van nang, da nang, cam nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu nganh) or (tien thanh)) - canh tranh va nang cong ((san toan) or (van toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu nganh) OR (tien thanh)) - canh tranh va nang cong ((san toan) OR (van toan)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu nganh) or (tien thanh)) - canh tranh va nang cong ((san toan) or (van toan)) cao*.