Perhaps you should try some spelling variations:
thien van » thi van
van chat » cao chat
chat soc » cham soc, chat hoc, chat doc
hanh tai » thanh tai, hang tai, han tai
su triet » su viet, su tien, ve triet
cao hoi » cau hoi, cao hoc, tao hoi
va hanh » van hanh, va thanh, va danh
tu sai » tu bai, tu san, tu cai
sai ky » sac ky
co hoi » co hoc, co loi
soc va » hoc va, loc va, doc va
tai su » tai so, tai tu, lai su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky nang ((cao hoi) OR (co hoi)). thien van chat soc va hanh tai su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky nang ((cao hoi) OR (co hoi)). thien van chat soc va hanh tai su triet".
• Adding a wildcard symbol may retrieve word variants: tu sai ky nang ((cao hoi) OR (co hoi)). thien van chat soc va hanh tai su triet*.