Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ve bac » ve ban, he bac, va bac
ve cac » va cac, vien cac
ve bao » te bao, va bao
bo van » vo van, so van, do van
x hoi » xa hoi, o hoi, x ho
vi va » vi van, vai va, vu va

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 sach ky nang x hoi. hieu ((((ve bac) OR (ve cac))) OR (ve bao)) bo van hanh vi va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu ((((ve bac) OR (ve cac))) or (ve bao)) bo van hanh vi va triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu ((((ve bac) OR (ve cac))) or (ve bao)) bo van hanh vi va triet*.