Perhaps you should try some spelling variations:
cua triet » va triet
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ban bo » can bo, ban do, ban co
bo van » vo van, so van, do van
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. hieu van ban bo van hanh vi ((((cua triet) OR (cua viet))) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu van ban bo van hanh vi ((((cua triet) OR (cua viet))) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu van ban bo van hanh vi ((((cua triet) OR (cua viet))) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu van ban bo van hanh vi ((((cua triet) OR (cua viet))) or (su triet))*.