Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
sang mai » sang ma, sang tai, lang mai
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
cam tuc » cam xuc, cam tu, nam thuc
hanh ve » hanh vi, hanh va, hanh kem
va hanh » van hanh, va thanh, va danh
van cam » van nam, van lam, van cau
mai hoi » mai khoi, dai hoi, lai hoi
co sach » bo sach, cuon sach, hoc sach
tuc va » thuc va, truc va, tuc xa
y sang » _ sang, duy sang
thiet » thieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (co sach)) y sang mai hoi. hieu van cam tuc va hanh ve ((cua viet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) y sang mai hoi. hieu van cam tuc va hanh ve ((cua viet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) y sang mai hoi. hieu van cam tuc va hanh ve ((cua viet) or (va thiet))*.