Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
nhieu tang » chieu sang, nhiet nang
hieu lang » chieu sang, hieu quang, hieu van
tranh cua » doanh cua, manh cua
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((nhieu tang) or (hieu lang)) - hanh tranh cua ((hang cong) or (dang cong)) tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((nhieu tang) OR (hieu lang)) - hanh tranh cua ((hang cong) OR (dang cong)) tac toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((nhieu tang) or (hieu lang)) - hanh tranh cua ((hang cong) or (dang cong)) tac toan cau*.