Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu cac » hieu luc, hieu va, hieu van
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cac cau » cac mau, bac cau, ca cau
va danh » va dinh, va hanh, dia danh
cua tre » cua te, cuu tre, cua triet
va dan » ca dan, va dao, va dau

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 cau truc ((va danh) OR (va dan)) dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. hieu cac cau truc ((va danh) OR (va dan)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu cac cau truc ((va danh) OR (va dan)) dai cua tre*.