Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
cham duc » cham soc, pham duy, phan duc
sach ty » sach tu, sach thu, xach tay
hieu va » lieu va, hieu qua
xang xa » lang xa, mang xa, ang xa
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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 ty) or (sach y)) xang xa hoi. hieu va ((cham duc) OR (pham duc)) ban thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) xang xa hoi. hieu va ((cham duc) OR (pham duc)) ban thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (sach y)) xang xa hoi. hieu va ((cham duc) OR (pham duc)) ban thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach y)) xang xa hoi. hieu va ((cham duc) OR (pham duc)) ban thanh vi cua tre*.