Perhaps you should try some spelling variations:
qua pham » quan pham, quy pham, qua cham
pham duy » pham duc
so sach » so sanh, bo sach, co sach
ty lang » tay lang, ty xang, ty hang
lang xa » lang ha, dang xay, lang van
duy va » duy vat, duy van, day va
va dan » ca dan, va dao, va dau
dan de » dan den, dang de, van de
cua te » cua tu
cua su » qua su

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: ((so sach) OR (vu bach)) ty lang xa hoi. hieu qua pham duy va dan de ((cua te) OR (cua su))~.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (vu bach)) ty lang xa hoi. hieu qua pham duy va dan de ((cua te) or (cua su))*.