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 cua » chinh ca, chinh sua, hinh cua
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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 cua cong nguong dan ((toan cau) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi ((hieu quang) OR (hieu quan)) - hanh chinh cua cong nguong dan ((toan cau) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi ((hieu quang) or (hieu quan)) - hanh chinh cua cong nguong dan ((toan cau) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: hoi ((hieu quang) or (hieu quan)) - hanh chinh cua cong nguong dan ((toan cau) OR (toan tap))*.