Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
doc sach » hoc sach, nuoc sach, dac sac
toc sach » hoc sach, thuoc sach, nuoc sach
hanh lai » hanh lam, hanh tai, thanh lap
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
va hanh » van hanh, va thanh, va danh
lai cua » dai cua, hai cua, lai chau
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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

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