Perhaps you should try some spelling variations:
thong trong » thuong trong, thong thong, thong thuong
thien hieu » thien nhien, thien chien, thien hue
doanh luan » doanh nhan
hieu quan » hieu qua, lieu quan, thien quan
trong van » trong cac
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 quan - hanh ((doanh cua) or (doanh luan)) thong trong van han tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thien hieu quan - hanh ((doanh cua) OR (doanh luan)) thong trong van han tai.
• Adding a wildcard symbol may retrieve word variants: thien hieu quan - hanh ((doanh cua) or (doanh luan)) thong trong van han tai*.