Perhaps you should try some spelling variations:
thieu quang » thien quan, trien quang, hieu quan
hieu quang » hieu quan, hieu qua, diep quang
hanh dung » thanh dung, anh dung, hanh dong
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

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu quang) OR (thieu quang)) - hanh dung 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) OR (thieu quang)) - hanh dung luan dung ((cong dan) or (cong tan)) toan cau~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu quang) OR (thieu quang)) - hanh dung luan dung ((cong dan) or (cong tan)) toan cau*.