Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tham soc » cham soc, tham nuoc, thai son
van tham » van thanh, van tuan, van chat
cuu tre » cau tren, cau treo
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cua triet, dua tren
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
soc va » hoc va, loc va, doc va
te san » te ban, ke san, tu san
te sac » te sach, te cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sac) OR (te san)) ky tang xa hoi. hieu van tham soc va hanh vi ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te san)) ky tang xa hoi. hieu van tham soc va hanh vi ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) OR (te san)) ky tang xa hoi. hieu van tham soc va hanh vi ((cuu tre) or (cua tre))".
• Adding a wildcard symbol may retrieve word variants: ((te sac) OR (te san)) ky tang xa hoi. hieu van tham soc va hanh vi ((cuu tre) or (cua tre))*.