Perhaps you should try some spelling variations:
quan phong » luan phong, tuan phong, quang phuong
hieu lang » chieu sang, hieu quang, nhieu tang
nang quan » ban quan, nang suat
doi hieu » doi chieu, doc hieu, doi hien
anh nang » ganh nang, anh bang, anh dang
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi hieu lang - anh nang quan phong ((cong dan) OR (cong tan)) ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - anh nang quan phong ((cong dan) OR (cong tan)) ((toan cau) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi hieu lang - anh nang quan phong ((cong dan) OR (cong tan)) ((toan cau) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - anh nang quan phong ((cong dan) OR (cong tan)) ((toan cau) or (toan ban))*.