Perhaps you should try some spelling variations:
hanh doanh » hang doanh, chinh doanh, doanh doanh
hieu quang » thieu quang, hieu qua, diep quang
hieu quan » hieu qua, lieu quan, thien quan
doanh cua » doanh luan
cua thong » cua thuong, cua khong, cua tong
van phanh » van thanh, van hanh, van khanh
van phan » van phong, van thanh, luan phan

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 doanh cua thong thong ((van phan) or (van phanh)) tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu quang) OR (hieu quan)) - hanh doanh cua thong thong ((van phan) OR (van phanh)) tai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu quang) OR (hieu quan)) - hanh doanh cua thong thong ((van phan) or (van phanh)) tai".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu quang) OR (hieu quan)) - hanh doanh cua thong thong ((van phan) or (van phanh)) tai*.