Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cuu ban » cuu van, cua ban, cuu san
cuc ban » cua ban, cac ban, duc ban
sach ky » sach y, sach ty, sach kem
van cam » van nam, van lam, van cau
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 ((cuc ban) OR (cuu 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 ((cuc ban) OR (cuu 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 ((cuc ban) OR (cuu 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 ((cuc ban) OR (cuu ban)) hanh vi cua tre*.