Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
hieu lang » chieu sang, hieu quang, nhieu tang
tranh cua » doanh cua, manh cua
nhung van » phung van, nhung bai, nhung cau
hang cong » dang cong, hang nong, bang cong
bai toan » bai tap
toan cau » toan cao, toan ban, toan tap
ho hieu » ho chieu, hoi hieu, nho hieu

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 hieu lang - hanh tranh cua ((((nhung van) OR (hang cong))) OR (thong thong)) bai toan cau~.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh tranh cua ((((nhung van) or (hang cong))) or (thong thong)) bai toan cau*.