Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
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)) xang xa hoi. lieu va cau truc van hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) OR (sach thu)) xang xa hoi. lieu va cau truc van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) OR (sach thu)) xang xa hoi. lieu va cau truc van hanh vi cua tre*.