Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hieu quang » thieu quang, hieu qua, diep quang
hieu quan » hieu qua, lieu quan, thien quan
trinh cua » tinh cua, trinh luat, trinh quan
cua thong » cua thuong, cua khong, cua tong
cong tac » cong ty
chan cau » phan cau, can cau, chinh cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu quang) OR (hieu quan)) - hanh trinh cua thong ((cong san) or (cong tac)) chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu quang) OR (hieu quan)) - hanh trinh cua thong ((cong san) OR (cong tac)) chan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu quang) OR (hieu quan)) - hanh trinh cua thong ((cong san) or (cong tac)) chan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu quang) OR (hieu quan)) - hanh trinh cua thong ((cong san) or (cong tac)) chan cau*.