Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
o hoi » co hoi, o hai, o hoa
o hoc » co hoc, mo hoc, so hoc
ve am » va am

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ((o hoi) OR (o hoc)). hieu ve am thuc va hanh dai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((o hoi) OR (o hoc)). hieu ve am thuc va hanh dai cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((o hoi) OR (o hoc)). hieu ve am thuc va hanh dai cua triet*.