Perhaps you should try some spelling variations:
nang hoc » nang doc, nang luc, dong hoc
nay thuc » nam thuc, cay thuc, day thuc
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
hoc hai » hoc dai, hoc bai, hoc tai
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, ban hanh
y nang » ky nang, ly nang, v nang
va nay » va ngay, va cay
vi cua » vai cua, di cua

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 y nang hoc hai. lieu va nay thuc va hanh vi cua viet~.
• Adding a wildcard symbol may retrieve word variants: su sach y nang hoc hai. lieu va nay thuc va hanh vi cua viet*.