Perhaps you should try some spelling variations:
sach thu » sach thue, sach tham, cach thuc
cau thuc » cau truc, cuu thuc, can thuc
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
sach ty » sach y, sach tu, xach tay
xang xa » lang xa, mang xa, ang xa
cua tre » cua te, cuu tre, cua triet
va cau » van cau, va cac, va dau
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 thu) or (sach thieu)))) xang xa hoi. lieu va cau thuc dan hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (((sach thu) OR (sach thieu)))) xang xa hoi. lieu va cau thuc dan hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (((sach thu) or (sach thieu)))) xang xa hoi. lieu va cau thuc dan hanh vi cua tre*.