Perhaps you should try some spelling variations:
tranh qua » tranh cua, thanh qua, trinh qua
hieu quan » hieu qua, lieu quan, thien quan
song cong » cong cong, tong cong, song hong
lieu van » lieu va, hieu van, sieu van
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi ((hieu quan) or (lieu van)) - canh tranh qua song cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi ((hieu quan) OR (lieu van)) - canh tranh qua song cong tac toan cao.
• Adding a wildcard symbol may retrieve word variants: hoi ((hieu quan) or (lieu van)) - canh tranh qua song cong tac toan cao*.