Perhaps you should try some spelling variations:
chao chao » cao chat, cao cho, chat cho
cao chao » cao chat, cao cho, cao cap
sach su » cach su, sach tu, sach uu
te sach » toc sach
dong ha » dong hoa, dong va, dong hoc
dang ha » dung ha, lang ha, tang ha
cua tre » cua te, cuu tre, cua triet
va dao » ca dao
dao di » dao do, dao du, dao li
di cua » dai cua, doi cua, de 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 ha) or (dong ha)) hoi. hieu ((cao chao) or (chao chao)) su va dao di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach su ((dang ha) OR (dong ha)) hoi. hieu ((cao chao) OR (chao chao)) su va dao di cua tre*.