Perhaps you should try some spelling variations:
sach van » sach va, bach van, cach van
sach han » sach tham, sach danh, sach nang
hieu va » lieu va, hieu qua
cao tuc » dao tuc, cao duc, cao suc
nang o » nang co, nang ho, nang ro
va cao » va cac, va co, va dao
xa dat » xa dai, va dat
cua te » cua tu
o hoi » co hoi, o hoc, o hai

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 van) or (sach han)) nang o hoi. hieu va cao tuc xa dat dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach van) OR (sach han)) nang o hoi. hieu va cao tuc xa dat dai cua te*.