Perhaps you should try some spelling variations:
cong nguong » cong nguon, cong thuong, cong luong
hieu quang » thieu quang, hieu qua, diep quang
nguong dan » huong dan
hieu quan » hieu qua, lieu quan, thien quan
chinh sua » chinh su, chinh cua, chinh luan
sua cong » cua cong, qua cong, su cong
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi ((hieu quang) or (hieu quan)) - hanh chinh sua cong nguong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi ((hieu quang) OR (hieu quan)) - hanh chinh sua cong nguong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: hoi ((hieu quang) or (hieu quan)) - hanh chinh sua cong nguong dan toan cau*.