Perhaps you should try some spelling variations:
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trang vai » trang tai, trang giai, trang trai
dung cong » dung trong
hoc viet » hoc hien
trang va » tran van, hang va
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » 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: ((hoc viet) or (hoc thiet)) tach - hanh ((trang va) or (trang vai)) dung cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc viet) OR (hoc thiet)) tach - hanh ((trang va) OR (trang vai)) dung cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: ((hoc viet) or (hoc thiet)) tach - hanh ((trang va) or (trang vai)) dung cong tac toan cau*.