Perhaps you should try some spelling variations:
truc ban » truc dan, truc van, truoc bang
thuc ban » thuoc ban, thuc dan, thu ban
sach ty » sach tu, sach thu, 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 y)) xang xa hoi. lieu va cau ((truc ban) or (thuc ban)) hanh 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. lieu va cau ((truc ban) OR (thuc ban)) hanh 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. lieu va cau ((truc ban) or (thuc ban)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) OR (sach y)) xang xa hoi. lieu va cau ((truc ban) or (thuc ban)) hanh vi cua tre*.