Perhaps you should try some spelling variations:
thiet tach » chiet tach, thuat tach
thien hach » thien thanh, hien hanh
tranh qua » tranh cua, thanh qua, trinh qua
trong tac » trong cac, tuong tac, trong tan
qua dung » quang dung, su dung, qua song
tac toan » tap toan, tam toan, hach toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thiet tach) or (thien hach)) - canh tranh qua dung trong tac toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet tach) OR (thien hach)) - canh tranh qua dung trong tac toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet tach) or (thien hach)) - canh tranh qua dung trong tac toan ban*.