Perhaps you should try some spelling variations:
doanh ban » doanh bat, doanh van, doanh nhan
hieu van » hieu va, thien van, lieu va
ban cua » ban quan
van cac » van hac, van cau, van bac
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, duc va
sac ky » cac ky, sai ky

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 (sac ky)) nang xa hoi. hieu van cac ((tuc va) OR (tuc xa)) doanh ban cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sac ky)) nang xa hoi. hieu van cac ((tuc va) OR (tuc xa)) doanh ban cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sac ky)) nang xa hoi. hieu van cac ((tuc va) OR (tuc xa)) doanh ban cua tre*".