Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
quoc ban » quoc bao, quoc lan, quoc quan
lang van » dang van, tang van, hoang van
van cau » van dau, van hau, van chat
xuc ban » duc ban, cuc ban, xuat ban
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((nang xa) or (lang van)) hoi. hieu van cau ((xuc ban) or (quoc ban)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (lang van)) hoi. hieu van cau ((xuc ban) OR (quoc ban)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) or (lang van)) hoi. hieu van cau ((xuc ban) or (quoc ban)) hanh vi cua tre*.