Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
te sach » toc sach
dan sai » danh sai, doan sai, dan tai
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
sach ky » sac ky, sach y, sach ty
va cham » va chat, va tham
cua tu » cua tuc, cua su, cua cu
va dan » ca dan, va dao, va dau
va cam » va cac, va cao, va cai

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 ky tang xa hoi. hieu ((va cam) OR (va cham)) duc va dan sai ((cua viet) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky tang xa hoi. hieu ((va cam) OR (va cham)) duc va dan sai ((cua viet) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky tang xa hoi. hieu ((va cam) OR (va cham)) duc va dan sai ((cua viet) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: te sach ky tang xa hoi. hieu ((va cam) OR (va cham)) duc va dan sai ((cua viet) or (cua tu))*.