Perhaps you should try some spelling variations:
nguong manh » nguong dan, luong manh, nhung manh
hieu quang » thieu quang, hieu qua, diep quang
duong manh » duong van
hieu quan » hieu qua, lieu quan, thien quan
chinh cua » chinh ca, chinh sua, hinh cua
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 cua cong ((nguong manh) OR (duong manh)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi ((hieu quang) OR (hieu quan)) - hanh chinh cua cong ((nguong manh) OR (duong manh)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi ((hieu quang) or (hieu quan)) - hanh chinh cua cong ((nguong manh) OR (duong manh)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoi ((hieu quang) or (hieu quan)) - hanh chinh cua cong ((nguong manh) OR (duong manh)) toan cau*.