Perhaps you should try some spelling variations:
doanh dan » doanh ban, doanh van, doanh dao
van doanh » toan doanh, van dong, van thanh
hieu van » hieu va, thien van, lieu va
luoc van » luoc can, luoc va, luc van
cac luoc » cac nuoc, cac cuoc, cac quoc
van cac » van hac, van cau, van bac
sach ty » sach y, sach thu, xach tay
lang xa » lang ha, dang xay, lang van
sach tu » sach thu, cach tu, sach uu
cua tu » cua tuc, cua su, cua cu

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach tu)) lang xa hoi. hieu van cac luoc van doanh dan ((cua te) OR (cua tu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) OR (sach tu)) lang xa hoi. hieu van cac luoc van doanh dan ((cua te) or (cua tu))~".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) OR (sach tu)) lang xa hoi. hieu van cac luoc van doanh dan ((cua te) or (cua tu))*.