Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tham soc » cham soc, tham nuoc, thai son
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
va hanh » van hanh, va thanh, va danh
luu tre » luu tru, cuu tre, luy tre
te sac » te sach, te cac, te san
soc va » hoc va, loc va, doc va
vi luu » vi lua

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 (toc sach)) ky lang xa hoi. ((lien quan) or (hieu qua)) tham soc va hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (toc sach)) ky lang xa hoi. ((lien quan) OR (hieu qua)) tham soc va hanh vi luu tre.
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (toc sach)) ky lang xa hoi. ((lien quan) or (hieu qua)) tham soc va hanh vi luu tre*.