Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu cac » hieu luc, hieu va, hieu van
can thuc » dan thuc, van thuc, cay thuc
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cac can » cac dan, cac van, cac ban
va dinh » van dinh, va kinh, va tinh
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang xa hoi. hieu cac can thuc ((va dinh) or (va hanh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu cac can thuc ((va dinh) OR (va hanh)) dai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu cac can thuc ((va dinh) or (va hanh)) dai cua tre*.