Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
tham soc » cham soc, tham nuoc, thai son
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
luu tre » luu tru, luy tre
cuu tre » cua tre, cau tren, cau treo
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
soc va » hoc va, loc va, doc va

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