Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
te sach » toc sach
tang xa » trang xa, tang ma, lang xa
hieu va » hieu qua
cao duc » dao duc, cao suc, giao duc
dan sai » danh sai, doan sai, dan tai
sach 7 » sach y, sach 2
7 tang » 6 tang
va dan » ca dan, va dao, va dau
cua tu » cua tuc, cua su, cua cu

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: te sach 7 tang xa hoi. ((hieu va) OR (lieu va)) cao duc va dan sai ((cua viet) OR (cua tu))~.
• Adding a wildcard symbol may retrieve word variants: te sach 7 tang xa hoi. ((hieu va) or (lieu va)) cao duc va dan sai ((cua viet) or (cua tu))*.