Perhaps you should try some spelling variations:
ban hanh » ban hang
cuc ban » cua ban, cac ban, cuu ban
van cau » van dau, van hau, van chat
van cam » van nam, van lam, van dam
sach ky » sach y, sach ty, sach kem
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
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: te ((sach ky) or (sac ky)) lang xa hoi. hieu ((van cam) OR (van cau)) cuc ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sac ky)) lang xa hoi. hieu ((van cam) OR (van cau)) cuc ban hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sac ky)) lang xa hoi. hieu ((van cam) OR (van cau)) cuc ban hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sac ky)) lang xa hoi. hieu ((van cam) OR (van cau)) cuc ban hanh vi cua tre*.