Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cau thuc » cau truc, cuu thuc, can thuc
hanh tai » thanh tai, hang tai, han tai
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
cao hoi » cau hoi, co hoi, tao hoi
cao hoc » co hoc, cho hoc, chat hoc
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
va cau » van cau, va cac, va dau

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 y nang ((cao hoi) OR (cao hoc)). lieu va cau thuc va hanh tai ((cua triet) OR (cua viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((cao hoi) OR (cao hoc)). lieu va cau thuc va hanh tai ((cua triet) or (cua viet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((cao hoi) OR (cao hoc)). lieu va cau thuc va hanh tai ((cua triet) or (cua viet))*.