Perhaps you should try some spelling variations:
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tranh cua » doanh cua, manh cua
ho chieu » theo chieu, hoc thieu, doi chieu
van cong » van dong, van phong, phan cong
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cau » toan cao, toan ban, toan tap
cua van » cua ban, cua vat, cua dan

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: ((ho chieu) OR (hoc thiet)) tach - canh tranh cua van cong tap toan cau~.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc thiet)) tach - canh tranh cua van cong tap toan cau*.