Perhaps you should try some spelling variations:
sach ky » sac ky, sach ty, sach kem
lai cua » dai cua, hai cua, lai chau
vai cua » dai cua, hai cua, bai cua
cach tu » cach thuc
va cach » va cac
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
ca dan » cac dan, ca dao
tu ca » tu cac, tu cua, tu can

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) OR (sach y)) nang xa hoi. hieu va cach tu ca dan ((vai cua) OR (lai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ky) OR (sach y)) nang xa hoi. hieu va cach tu ca dan ((vai cua) or (lai cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ky) OR (sach y)) nang xa hoi. hieu va cach tu ca dan ((vai cua) or (lai cua)) tre*.