Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach thu, xach tay
sach tu » sach thu, cach tu, sach uu
lang xa » lang ha, dang xay, lang van
van lam » van nam
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: te ((sach ty) or (sach tu)) lang xa hoi. hieu van lam ((dung va) or (duc va)) doanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach tu)) lang xa hoi. hieu van lam ((dung va) OR (duc va)) doanh van cua tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach tu)) lang xa hoi. hieu van lam ((dung va) or (duc va)) doanh van cua tre*.