Perhaps you should try some spelling variations:
hanh doanh » hang doanh, chinh doanh, doanh doanh
doanh luan » doanh nhan
luan thong » luan phong, luan tuong, luat thong
hieu quan » lieu quan, thien quan, lien quan
thong van » trong van, thong va, thong quan
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai

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

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