Perhaps you should try some spelling variations:
thieu manh » hieu manh, tien manh, trieu minh
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
tranh cua » doanh cua, manh cua
cua nhung » va nhung
tac toan » tam toan, hach toan, tich toan
tap toan » tap doan, tap quan, bai toan

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: hoc thieu manh - canh tranh cua nhung cong ((((tac toan) OR (tinh toan))) OR (tap toan)) cau~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu manh - canh tranh cua nhung cong ((((tac toan) or (tinh toan))) or (tap toan)) cau*.