Perhaps you should try some spelling variations:
thien van » thi van
cua triet » cua viet, va triet
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
nang ro » nang co, nang ho, nang ra
van cac » van hac, van cau, van bac
cac toc » cac toi, cac nuoc, cac thoi
toc van » hoc van, toc san, tac van
ro hoi » co hoi, o hoi, mo hoi
su dai » sau dai, si dai, su tai
su sai » su tai, su hai, su mai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sai) OR (su dai)) ky nang ro hoi. thien van cac toc van hanh vi ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sai) OR (su dai)) ky nang ro hoi. thien van cac toc van hanh vi ((cua triet) OR (su triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sai) OR (su dai)) ky nang ro hoi. thien van cac toc van hanh vi ((cua triet) or (su triet))*".