Perhaps you should try some spelling variations:
nay thuc » nam thuc, cay thuc, day thuc
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
ly nang » ky nang, ly hang, ly vang
van hoi » van hoa, van hoc, van hoe
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
y nang » ky nang, v nang, may nang
va nay » va ngay, va cay
vi su » va su, ve su, ki su

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) or (ly nang)) van hoi. hieu va nay thuc va hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (ly nang)) van hoi. hieu va nay thuc va hanh vi su triet*.