Perhaps you should try some spelling variations:
te sach » toc sach
y quang » ly quang, _ quang, x quang
cua hoi » cua moi
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
su tien » su kien, su hien, tu tieng
ca viet » va viet, co viet, hoa viet
va cam » va cham, va cac, va cao

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 y quang ((cua hoi) or (xa hoi)). hieu va cam duc va hanh vi ((su tien) or (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y quang ((cua hoi) OR (xa hoi)). hieu va cam duc va hanh vi ((su tien) OR (ca viet)).
• Adding a wildcard symbol may retrieve word variants: te sach y quang ((cua hoi) or (xa hoi)). hieu va cam duc va hanh vi ((su tien) or (ca viet))*.