Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dai » hanh tai, hanh dao, vanh dai
sach ty » sach y, sach thu, xach tay
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
sach tu » sach thu, cach tu, sach uu
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi
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 ty) OR (sach tu)) 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 ty) OR (sach tu)) 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 ty) OR (sach tu)) 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 ty) OR (sach tu)) nang ((x hoi) or (o hoi)). hieu ve am thuc va hanh dai cua triet*.