Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vat hanh » vat thanh, van hanh, va hanh
hanh dai » hanh tai, hanh dao, vanh dai
te sach » toc sach
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, ma hoa, me hoi
va cuu » va chu, va huu
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: te sach y nang ((ma hoi) OR (xa hoi)). lieu ((va cuu) OR (va cau)) thuc vat hanh dai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((ma hoi) or (xa hoi)). lieu ((va cuu) OR (va cau)) thuc vat hanh dai cua triet~".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((ma hoi) or (xa hoi)). lieu ((va cuu) OR (va cau)) thuc vat hanh dai cua triet*.