Perhaps you should try some spelling variations:
doanh ban » doanh bat, doanh van, doanh nhan
hieu van » hieu va, thien van, lieu va
tang van » dang van, hoang van, trong van
van pham » san pham, van phan, van phat
ban cua » ban quan
duc vay » duc van, duc vy
te sach » toc sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky ((lang xa) or (tang van)) hoi. hieu van pham ((duc vay) OR (duc va)) doanh ban cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((lang xa) OR (tang van)) hoi. hieu van pham ((duc vay) OR (duc va)) doanh ban cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((lang xa) or (tang van)) hoi. hieu van pham ((duc vay) OR (duc va)) doanh ban cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((lang xa) or (tang van)) hoi. hieu van pham ((duc vay) OR (duc va)) doanh ban cua tre*.