Perhaps you should try some spelling variations:
thong trong » thuong trong, thong thong, thong thuong
doanh doanh » toan doanh, doanh hoan, doanh thanh
chieu qua » khien qua, hieu cua, hieu quan
doanh cua » doanh luan
cua thong » cua thuong, cua khong, cua tong
trong van » trong cac
van van » van ban, tan van, san van
van tai » von tai, van tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu qua) or (hieu qua)) - doanh doanh cua thong trong van van tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu qua) OR (hieu qua)) - doanh doanh cua thong trong van van tai.
• Adding a wildcard symbol may retrieve word variants: theo ((chieu qua) or (hieu qua)) - doanh doanh cua thong trong van van tai*.