Perhaps you should try some spelling variations:
co sach » bo sach, cuon sach, hoc sach
ly hang » ly quang
hang xa » hoang xa, hang va, hang ca
hieu ve » hieu va, hieu van
cua tre » cuu tre, cua triet, dua tren
cac tuc » cac toc, cac tu, cac tac
sach ly » sach y, sach lo, sach ty
ca dan » cac dan, ca dao
va dan » va dao, va dau, va dap
ve cac » va cac, vien cac
cua te » cua tu

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: co sach ly hang xa hoi. hieu ve cac tuc ((va dan) OR (ca dan)) tai ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ly hang xa hoi. hieu ve cac tuc ((va dan) OR (ca dan)) tai ((cua tre) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: co sach ly hang xa hoi. hieu ve cac tuc ((va dan) OR (ca dan)) tai ((cua tre) or (cua te))*.