Perhaps you should try some spelling variations:
cao chao » chao chao, cao chat, cao cap
cao cho » cap cho, cao chat
cach su » cach tu, hoach su
te cach » ve cach, te sach, tu cach
dang ha » dong ha, dung ha, lang ha
dang xa » dang xay, lang xa, dang va
cua tre » cua te, cuu tre, cua triet
va dao » ca dao
dao vi » dao voi, dao ve, dao va
vi cua » vai cua, di 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 cach su ((dang xa) OR (dang ha)) hoi. hieu ((cao chao) or (cao cho)) su va dao vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cach su ((dang xa) OR (dang ha)) hoi. hieu ((cao chao) OR (cao cho)) su va dao vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cach su ((dang xa) OR (dang ha)) hoi. hieu ((cao chao) or (cao cho)) su va dao vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te cach su ((dang xa) OR (dang ha)) hoi. hieu ((cao chao) or (cao cho)) su va dao vi cua tre*.