Perhaps you should try some spelling variations:
vao triet » va triet, mao triet, va trien
tu cach » tu cac
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
v nang » va nang, vu nang, van nang
nang o » nang co, nang ho, nang ro
va cau » van cau, va cac, va dau
cau tu » dau tu, cau truc
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (su sach)) v nang o hoi. lieu va cau tu va hanh di vao triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (su sach)) v nang o hoi. lieu va cau tu va hanh di vao triet*.