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 danh » va dinh, va dan, va hanh
vai cua » dai cua, hai cua, lai cua
va cam » va cham, va cac, va cao
va dao » ca dao
xuc va » duc va, tuc va, luc va
vi cua » di cua

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) or (va dao)) xuc va danh ((vi cua) or (vai cua)) vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. hieu ((va cam) OR (va dao)) xuc va danh ((vi cua) OR (vai cua)) vat.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. hieu ((va cam) or (va dao)) xuc va danh ((vi cua) or (vai cua)) vat*.