Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dinh vai » dinh van, dinh vi, dinh va
dan dinh » dang dinh, doan dinh, van dinh
thuc dan » thuc hanh, hoc dan, thuc vat
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
vai cua » dai cua, hai cua, lai cua
va cam » va cham, va cac, va cao
co hoi » co loi
va am » va lam

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: thu sach ky nang ((co hoi) OR (co hoc)). hieu ((va am) OR (va cam)) thuc dan dinh vai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ((co hoi) OR (co hoc)). hieu ((va am) or (va cam)) thuc dan dinh vai cua triet~".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((co hoi) OR (co hoc)). hieu ((va am) or (va cam)) thuc dan dinh vai cua triet*.