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