Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
hanh vai » hanh vi, hanh va, hanh tai
va triet » va thiet, va trien, ve triet
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ki » sach kinh, sach bai, sach kem
ki nang » ky nang
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
ve nam » he nam, va nam, le nam
x hoi » xa hoi, o hoi, x ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ki nang x hoi. hieu ve nam thuc va hanh vai ((va triet) OR (su triet))~.
• Adding a wildcard symbol may retrieve word variants: tu sach ki nang x hoi. hieu ve nam thuc va hanh vai ((va triet) or (su triet))*.