Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
tu nano » truc nano
hieu vu » hieu va, hieu ve, hieu su
vu pham » su pham, vi pham, vu kham
va hanh » va thanh, va danh, ban hanh
tu nang » tru nang, tu nong, tu lang
tu sach » thu sach, su sach, te sach
de cua » le cua, te cua, dieu cua
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 ((tu nang) or (tu nano)) x hoi. hieu vu pham duc ((va hanh) OR (van hanh)) de cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu nang) OR (tu nano)) x hoi. hieu vu pham duc ((va hanh) OR (van hanh)) de cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tu nang) or (tu nano)) x hoi. hieu vu pham duc ((va hanh) OR (van hanh)) de cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu nang) or (tu nano)) x hoi. hieu vu pham duc ((va hanh) OR (van hanh)) de cua triet*.