Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
hanh dang » hanh dong, hanh dung, hanh mang
luan hung » luan chung, lan hung, luan ung
anh dang » anh dong, anh dung, anh bang
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
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 - ((hanh dang) or (anh dang)) luan hung ((cong dan) OR (cong tan)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - ((hanh dang) OR (anh dang)) luan hung ((cong dan) OR (cong tan)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - ((hanh dang) or (anh dang)) luan hung ((cong dan) OR (cong tan)) toan cau".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - ((hanh dang) or (anh dang)) luan hung ((cong dan) OR (cong tan)) toan cau*.