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