Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
tham soc » cham soc, tham nuoc, thai son
cuu tre » cua tre, cau tren, cau treo
va hanh » van hanh, va thanh, va danh
luy tre » luyen tre
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
sac ky » cac ky, sai ky
soc va » hoc va, loc va, doc va
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 lang xa hoi. ((hieu quan) or (hieu qua)) tham soc va hanh vi ((cuu tre) or (luy tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky lang xa hoi. ((hieu quan) OR (hieu qua)) tham soc va hanh vi ((cuu tre) OR (luy tre)).
• Adding a wildcard symbol may retrieve word variants: te sac ky lang xa hoi. ((hieu quan) or (hieu qua)) tham soc va hanh vi ((cuu tre) or (luy tre))*.