Perhaps you should try some spelling variations:
tham soc » cham soc, tham nuoc, ham so
thai son » thai den, thai do, thai hoc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
tang xa » trang xa, tang ma, lang xa
hieu va » lieu va
ky tang » ky nang, ky dang, kho tang
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
te sac » te sach, te cac, te san

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