Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cao quoc » cac quoc, cao thuoc, han quoc
hanh che » han che, hanh he, hanh nghe
tu sach » thu sach, su sach, te sach
qua cao » qua cac, qua ca, qua cai
quoc va » nuoc va, duoc va, quoc gia
va hanh » van hanh, va thanh, va danh
che cua » cheo cua, chi cua, cho cua
tu sac » tu cac, tu san, tu bac
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: ((tu sac) OR (tu sach)) ky nang o hoi. hieu qua cao quoc va hanh che cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) OR (tu sach)) ky nang o hoi. hieu qua cao quoc va hanh che cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) OR (tu sach)) ky nang o hoi. hieu qua cao quoc va hanh che cua triet*.