Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
toc sach » hoc sach, doc sach, thuoc sach
thuc day » thuc dan, thuc vat
dinh dat » dinh van, dinh lam, binh dan
va triet » va thiet, va trien, ve triet
va nham » va cham, va tham, va nha
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang x hoi. lieu va nham thuc day ((dinh dat) OR (dinh ket)) va triet~".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang x hoi. lieu va nham thuc day ((dinh dat) OR (dinh ket)) va triet*.