Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dai » hanh tai, hanh dao, vanh dai
sach ky » sac ky, sach ty, sach kem
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai
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) OR (sach y)) nang ((x hoi) or (o hoi)). hieu ve am thuc va hanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang ((x hoi) OR (o hoi)). 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) OR (sach y)) nang ((x hoi) or (o hoi)). hieu ve am thuc va hanh dai cua triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach y)) nang ((x hoi) or (o hoi)). hieu ve am thuc va hanh dai cua triet*.