Perhaps you should try some spelling variations:
chao chao » cao chat, cao cho, chat cho
dau tren » dau tien, dat tren, dau tieng
cau tren » cu tren, ca tren, cau treo
cao chao » cao chat, cao cho, cao cap
sach su » cach su, sach tu, sach uu
te sach » toc sach
dang ha » dong ha, dung ha, lang ha
su dang » su dung
ha hoi » hoa hoi, ha noi, xa hoi
va dao » ca dao
dao vi » dao voi, dao ve, dao va
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 hoi. hieu ((cao chao) or (chao chao)) su va dao vi ((cau tren) OR (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach su dang ha hoi. hieu ((cao chao) OR (chao chao)) su va dao vi ((cau tren) OR (dau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach su dang ha hoi. hieu ((cao chao) or (chao chao)) su va dao vi ((cau tren) OR (dau tren))".
• Adding a wildcard symbol may retrieve word variants: te sach su dang ha hoi. hieu ((cao chao) or (chao chao)) su va dao vi ((cau tren) OR (dau tren))*.