Perhaps you should try some spelling variations:
nhung cuong » nhung cong, hung cuong, nhung chong
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh cua » doanh cua, manh cua
cua nhung » va nhung
cuong bai » uong bi, cuong ma
hieu luc » hieu luat, hieu qua
bai toan » bai tap
toan tap » toan ban
hieu va » lieu va, hieu qua

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu luc) or (hieu va)) - hanh tranh cua nhung cuong bai toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu luc) OR (hieu va)) - hanh tranh cua nhung cuong bai toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu luc) or (hieu va)) - hanh tranh cua nhung cuong bai toan tap*.