Perhaps you should try some spelling variations:
sach thien » sach thieu, sach tien, cach thien
thien lang » thien bang, thien dang, thien nang
doanh ban » doanh bat, doanh van, doanh nhan
va doanh » van doanh, vay doanh, va danh
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ban cua » ban quan
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach thien lang xa hoi. ((hieu ve) or (hieu qua)) cam xuc va doanh ban cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thien lang xa hoi. ((hieu ve) OR (hieu qua)) cam xuc va doanh ban cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach thien lang xa hoi. ((hieu ve) or (hieu qua)) cam xuc va doanh ban cua tre*.