Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va trien » va truyen, va thiet, va tuyen
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va xanh » va danh, va anh, va banh
va hanh » van hanh, va thanh, va danh
va cam » va cham, va cac, va cao
cua te » cua tu

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 va cam xuc ((va xanh) OR (va hanh)) di ((cua te) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. hieu va cam xuc ((va xanh) OR (va hanh)) di ((cua te) OR (va trien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang xa hoi. hieu va cam xuc ((va xanh) OR (va hanh)) di ((cua te) or (va trien))".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. hieu va cam xuc ((va xanh) OR (va hanh)) di ((cua te) or (va trien))*.