Perhaps you should try some spelling variations:
te sach » toc sach
sang xa » song xa, lang xa, sang ma
hieu ve » hieu va, hieu van
cac duc » cac du, cac dac, cac nuoc
cao duc » dao duc, cao suc, giao duc
va tinh » may tinh
dat cua » dai cua, day cua, dan cua
mat cua » ma cua, manh cua, mang cua
y sang » _ sang, duy sang

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: te sach y sang xa hoi. hieu ve ((cac duc) OR (cao duc)) va tinh ((dat cua) OR (mat cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y sang xa hoi. hieu ve ((cac duc) or (cao duc)) va tinh ((dat cua) OR (mat cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: te sach y sang xa hoi. hieu ve ((cac duc) or (cao duc)) va tinh ((dat cua) OR (mat cua)) tre*.