Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh ve » hanh ve, thanh va, thanh vien
nam thuc » nam thuoc, am thuc, nam thu
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
co sach » bo sach, cuon sach, hoc sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
ve nam » he nam, va nam, le nam
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
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 nang ma hoi. hieu ve nam thuc va thanh ve ((cua triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) y nang ma hoi. hieu ve nam thuc va thanh ve ((cua triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) y nang ma hoi. hieu ve nam thuc va thanh ve ((cua triet) or (va thiet))*.