Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
cua tre » cua te, cuu tre, cua triet
tai cua » thai cua, tai cuc, tri cua
van han » van hanh, van phan, van nhan
va cham » va chat, va tham
hieu va » lieu va, hieu qua
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
va han » va phan, va hanh, va hang
tu san » thu san, tu ban, tu can
te cac » tu cac, ve cac, te cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te cac) or (tu san)) ky tang xa hoi. hieu va cham duc ((va han) OR (van han)) tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te cac) OR (tu san)) ky tang xa hoi. hieu va cham duc ((va han) OR (van han)) tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te cac) or (tu san)) ky tang xa hoi. hieu va cham duc ((va han) OR (van han)) tai cua tre*".