Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
va hanh » van hanh, va thanh, va danh
pham tu » phan tu, pham thi, pham tai
cham tu » cam tu, chai tu, chay tu
hieu ve » hieu va, hieu van
san ky » sang ky, van ky, ban ky
nang o » nang co, nang ho, nang ro
dan ky » van ky
vi cua » vai cua, di cua
o hoi » co hoi, o hoc, o hai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((san ky) OR (dan ky)) nang o hoi. hieu ve ((cham tu) OR (pham tu)) va hanh vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((san ky) OR (dan ky)) nang o hoi. hieu ve ((cham tu) or (pham tu)) va hanh vi cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu ((san ky) OR (dan ky)) nang o hoi. hieu ve ((cham tu) or (pham tu)) va hanh vi cua triet*.