Perhaps you should try some spelling variations:
sach luan » sach luyen, sach han, san luan
luan nang » luan van, van nang, luan san
te sach » toc sach
hoi cua » hoi chuc
hai cua » thai cua, dai cua, lai cua
va lang » va nang, hoa lang
cao duc » dao duc, cao suc, giao duc
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ve cao » va cao, ve bao, ve cac
ma hoi » xa hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach luan nang ((ma hoi) or (mai hoi)). hieu ve cao duc va lang ((hai cua) OR (hoi cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach luan nang ((ma hoi) OR (mai hoi)). hieu ve cao duc va lang ((hai cua) OR (hoi cua)) te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach luan nang ((ma hoi) or (mai hoi)). hieu ve cao duc va lang ((hai cua) OR (hoi cua)) te*".