Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
toc sach » doc sach, thuoc sach, nuoc sach
van quan » van ban
hoc sach » hoc sinh, hoc cac, hoc anh
va doanh » van doanh, vay doanh, va danh
van cac » van hac, van bac, dan cac
van cau » van dau, van hau, van chat
dang ha » dong ha, dung ha, lang ha
ky dang » ky nang, ky danh
quan te » quan he, quan ve, quang tue
ha hoi » hoa hoi, ha noi, xa hoi
toc va » hoc va, toc ta, tuc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) OR (hoc sach)) ky dang ha hoi. thi ((van cac) or (van cau)) toc va doanh van quan te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) ky dang ha hoi. thi ((van cac) OR (van cau)) toc va doanh van quan te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) ky dang ha hoi. thi ((van cac) or (van cau)) toc va doanh van quan te*".