Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
sach thu » sach thue, sach thieu, sach tham
va doanh » van doanh, vay doanh, va danh
kham xuc » kham xung, kham cuoc, chat xuc
tu sach » thu sach, su sach, te sach
van cua » vang cua, ban cua, dan cua
hieu vu » hieu va, hieu ve, hieu su
bang va » ban va, trang va, dang van
cua tre » cua te, cuu tre, cua triet

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: tu sach thu ((bang va) OR (hang va)) hoi. hieu vu ((kham xuc) OR (cam xuc)) va doanh van cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu ((bang va) or (hang va)) hoi. hieu vu ((kham xuc) OR (cam xuc)) va doanh van cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach thu ((bang va) or (hang va)) hoi. hieu vu ((kham xuc) OR (cam xuc)) va doanh van cua tre*.