Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
dua ban » dia ban, cua ban, qua ban
duc ban » duc tan, duc van, duc man
van cam » van nam, van lam, van cau
lang xa » lang ha, dang xay, lang van
sac ky » cac ky
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (sai ky)) lang xa hoi. hieu van cam ((duc ban) OR (dua ban)) hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) or (sai ky)) lang xa hoi. hieu van cam ((duc ban) OR (dua ban)) hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (sai ky)) lang xa hoi. hieu van cam ((duc ban) OR (dua ban)) hanh vi cua tre*.