Perhaps you should try some spelling variations:
hanh doanh » hang doanh, chinh doanh, doanh doanh
luan thong » luan tuong, luat thong, xuan thong
luan phong » luan phuong, xuan phuong, van phong
lieu quan » lien quan, lieu van
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: thien ((hieu qua) or (lieu quan)) - hanh doanh ((luan thong) OR (luan phong)) thong van han tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thien ((hieu qua) OR (lieu quan)) - hanh doanh ((luan thong) OR (luan phong)) thong van han tai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thien ((hieu qua) or (lieu quan)) - hanh doanh ((luan thong) OR (luan phong)) thong van han tai".
• Adding a wildcard symbol may retrieve word variants: thien ((hieu qua) or (lieu quan)) - hanh doanh ((luan thong) OR (luan phong)) thong van han tai*.