Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
va triet » va thiet, va trien, ve triet
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky dung » ly dung, ky dang, ky vung
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
va hoi » xa hoi, va hoc, va hoa
ve nam » he nam, va nam, le nam

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 dung va hoi. hieu ve nam thuc va hanh vi ((cua tre) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dung va hoi. hieu ve nam thuc va hanh vi ((cua tre) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: te sach ky dung va hoi. hieu ve nam thuc va hanh vi ((cua tre) or (va triet))*.