Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
theo hieu » theo chieu, theo tieu, thien hieu
doanh cua » doanh luan
cua thong » cua thuong, cua khong, cua tong
thong van » trong van, thong va, thong quan
van tuan » van quan, van ban, anh tuan
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 qua - doanh doanh cua thong thong van ((han tai) or (van tuan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu qua - doanh doanh cua thong thong van ((han tai) OR (van tuan)).
• Adding a wildcard symbol may retrieve word variants: theo hieu qua - doanh doanh cua thong thong van ((han tai) or (van tuan))*.