Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
thu sach » tu sach, thuat sach, thuoc sach
va doanh » van doanh, vay doanh, va danh
hieu van » hieu va, thien van, lieu va
thue ban » thu ban, thuat ban, thue quan
thuc ban » thuoc ban, thuc dan, thu ban
van cam » van nam, van lam, van cau
cua tre » cua te, cuu tre, cua triet
va hoi » xa hoi, va hoc, va hoa
cam tu » cam thu, nam tu, dam tu
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((thue ban) OR (thuc ban)) va hoi. hieu van cam tu va doanh van ((cua tre) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((thue ban) OR (thuc ban)) va hoi. hieu van cam tu va doanh van ((cua tre) OR (cua tu))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((thue ban) OR (thuc ban)) va hoi. hieu van cam tu va doanh van ((cua tre) or (cua tu))*".