Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
van doanh » toan doanh, van dong, van thanh
cac thoi » cac toi, cac hop, cac tro
hieu van » hieu va, thien van, lieu va
cac toc » cac toi, cac nuoc
van cua » vang cua, ban cua, dan cua
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 te » cua tu

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 ((cac toc) or (cac thoi)) van doanh van cua te~.
• 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 toc) OR (cac thoi)) van doanh van cua te*.
• 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 toc) or (cac thoi)) van doanh van cua te*".