Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
dia danh » dia ban, gia dinh
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
nam xuc » cam xuc, nam xua, nam thuc
va hanh » van hanh, va thanh, va danh
cua te » cua tu
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang xa hoi. hieu van nam xuc ((va hanh) or (dia danh)) tri ((cua te) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. hieu van nam xuc ((va hanh) OR (dia danh)) tri ((cua te) OR (cua su)).
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. hieu van nam xuc ((va hanh) or (dia danh)) tri ((cua te) or (cua su))*.