Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
hieu quang » thieu quang, hieu qua, diep quang
cua thuong » cua truong, ca thuong, cua huong
cua phuong » cuu phuong, cuc phuong, luan phuong
hieu quan » hieu qua, lieu quan, thien quan
thong van » trong van, thong va, thong quan
van han » van hanh, van phan, van nhan
han tai » hang tai, nhan tai, van tai

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