Perhaps you should try some spelling variations:
doanh vai » doanh tai, doanh van, doanh giai
hieu van » hieu va, thien van, lieu va
lam duoc » nam duoc, luat duoc, lam thuoc
doanh va » doan va, doanh tai, doanh cua
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
van lam » van nam
duoc ma » duoc lam
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 hoi. hieu van lam duoc ma ((doanh vai) or (doanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang xa hoi. hieu van lam duoc ma ((doanh vai) OR (doanh va)) cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky lang xa hoi. hieu van lam duoc ma ((doanh vai) or (doanh va)) cua tre*.