Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va cham » va chat
va tham » van tham, va thanh, va thuat
va danh » va dan, va hanh, dia danh
va dinh » van dinh, va kinh, va tinh
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. lieu ((va cham) OR (va tham)) thuc ((va danh) OR (va dinh)) doi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang xa hoi. lieu ((va cham) or (va tham)) thuc ((va danh) OR (va dinh)) doi cua tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. lieu ((va cham) or (va tham)) thuc ((va danh) OR (va dinh)) doi cua tre*.