Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
vay doanh » van doanh, ly doanh, voi doanh
thu sach » tu sach, thuat sach, thuoc sach
cham xuc » cam xuc, chat xuc, cham soc
sach thu » sach thue, sach thieu, sach tham
van cua » vang cua, ban cua, dan cua
xuc vay » xuc hay
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
hieu vu » hieu ve, hieu su, dieu vu
lang xa » lang ha, dang xay, lang van
bang xa » bang va, mang xa, ang xa

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 thu ((bang xa) or (lang xa)) hoi. ((hieu vu) OR (hieu va)) cham xuc vay doanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach thu ((bang xa) OR (lang xa)) hoi. ((hieu vu) OR (hieu va)) cham xuc vay doanh van cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach thu ((bang xa) or (lang xa)) hoi. ((hieu vu) OR (hieu va)) cham xuc vay doanh van cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach thu ((bang xa) or (lang xa)) hoi. ((hieu vu) OR (hieu va)) cham xuc vay doanh van cua tre*.