Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
nhieu tang » chieu sang, nhiet nang
hieu lang » chieu sang, hieu quang, hieu van
hoc tapg » hoc tang, hoc tai, hoc lap
cong san » cong tac
san than » sang than, san thanh, ban than
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: he ((nhieu tang) OR (hieu lang)) - hanh trang ((hoc tapg) or (hoc tap)) cong san than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: he ((nhieu tang) OR (hieu lang)) - hanh trang ((hoc tapg) OR (hoc tap)) cong san than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "he ((nhieu tang) OR (hieu lang)) - hanh trang ((hoc tapg) or (hoc tap)) cong san than cau".
• Adding a wildcard symbol may retrieve word variants: he ((nhieu tang) OR (hieu lang)) - hanh trang ((hoc tapg) or (hoc tap)) cong san than cau*.