Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
pham duy » pham duc
van hanh » van thanh, ban hanh, van anh
cham duc » pham duc, cham soc, phan duc
va hanh » va thanh, va danh, ban hanh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
mau va » mau van, dau va, lau va
x hoi » xa hoi, o hoi, x ho

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