Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
van cam » van nam, van lam, van cau
duc ban » duc tan, dua ban, duc man
duc van » duc va, duc tan, duc manh
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

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 cac ky lang xa hoi. hieu van cam ((duc ban) OR (duc van)) hanh vi ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky lang xa hoi. hieu van cam ((duc ban) or (duc van)) hanh vi ((cua tre) OR (cua te))~".
• Adding a wildcard symbol may retrieve word variants: tu cac ky lang xa hoi. hieu van cam ((duc ban) or (duc van)) hanh vi ((cua tre) OR (cua te))*.