Perhaps you should try some spelling variations:
tieu tinh » trieu tinh, tieu trinh, lieu tinh
dung cong » dung trong
long vat » luong vat, dong vat, luong van
long van » luong van, song van, lang 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.

• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu tinh - thang ((long vat) OR (long van)) dung cong tac toan cao~.
• Adding a wildcard symbol may retrieve word variants: theo tieu tinh - thang ((long vat) or (long van)) dung cong tac toan cao*.