Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
hoc tang » hoc tan, hoc tieng, hoc trong
hoc bang » hoc bong, hoc dan, hoc bai
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
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.

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