Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
sach ty » sach tu, sach thu, xach tay
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) OR (sach y)) nang xa hoi. hieu va cam duc ((va hanh) or (van thanh)) lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang xa hoi. hieu va cam duc ((va hanh) OR (van thanh)) lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach y)) nang xa hoi. hieu va cam duc ((va hanh) or (van thanh)) lai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach y)) nang xa hoi. hieu va cam duc ((va hanh) or (van thanh)) lai cua tre*.