Perhaps you should try some spelling variations:
voi doanh » von doanh, tri doanh, hoa doanh
doanh van » doan van, doanh va, doanh ban
lang van » dang van, tang van, hoang van
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay
duc voi » duc loi, dua voi, duc vui
van cua » vang cua, ban cua, dan cua
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: toc sach ky ((lang xa) or (lang van)) hoi. hieu van pham duc voi doanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((lang xa) OR (lang van)) hoi. hieu van pham duc voi doanh van cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((lang xa) or (lang van)) hoi. hieu van pham duc voi doanh van cua tre*.