Perhaps you should try some spelling variations:
sach tru » sach truc, sach thu, sach tren
ban hanh » ban hang
sach tu » sach thu, cach tu, sach ty
nang xa » nang x, lang xa, nang ma
van cau » van dau, van hau, van chat
cuc ban » cua ban, cac ban, cuu ban
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 tru) OR (sach tu)) nang xa hoi. thien ((van nam) or (van cau)) cuc ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach tru) OR (sach tu)) nang xa hoi. thien ((van nam) OR (van cau)) cuc ban hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach tru) OR (sach tu)) nang xa hoi. thien ((van nam) or (van cau)) cuc ban hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach tru) OR (sach tu)) nang xa hoi. thien ((van nam) or (van cau)) cuc ban hanh vi cua tre*.