Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
toc sach » hoc sach, doc sach, thuoc sach
va doanh » van doanh, vay doanh, va danh
lam duoc » nam duoc, luat duoc, lam thuoc
hieu van » thien van, lieu va, hieu ve
lang van » dang van, tang van, hoang van
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
duoc va » nuoc va, duc va, duoc ma
lang xa » lang ha, dang xay
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) or (hieu va)) lam duoc va 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) OR (hieu va)) lam duoc va doanh van cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((lang xa) or (lang van)) hoi. ((hieu van) or (hieu va)) lam duoc va doanh van cua tre*.