Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
cham duc » pham duc, cham soc, pham duy
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano
va hanh » va thanh, va danh, ban hanh

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