Perhaps you should try some spelling variations:
chao chao » cao cho, chat cho, chao chu
te sach » toc sach
sach su » cach su, sach tu, sach uu
su dang » su dung
dang xa » dang xay, lang xa, dang ha
cua tre » cua te, cuu tre, cua triet
va dao » ca dao
dao ve » bao ve, dap ve, dau ve
ve cua » le cua, de cua, te cua
su va » su van, tu va

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 su dang xa hoi. hieu ((cao chat) or (chao chao)) su va dao ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach su dang xa hoi. hieu ((cao chat) OR (chao chao)) su va dao ve cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach su dang xa hoi. hieu ((cao chat) or (chao chao)) su va dao ve cua tre*.