Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
sach thu » sach thue, sach thieu, sach tham
thu bang » thu ban, thu hang, chu bang
va doanh » van doanh, vay doanh, va danh
kham xuc » kham xung, kham cuoc, cam xuc
van cua » vang cua, ban cua, dan cua
vu kham » vu khanh
tu sach » thu sach, su sach, te sach
hieu vu » hieu va, hieu ve, hieu su
cua tre » cua te, cuu tre, cua triet
va hoa » van hoa, va hoc, ma hoa
xuc va » duc va, tuc va, luc va
va hoi » xa hoi, va hoc

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

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