Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
dua tren » dung tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va hanh » va thanh, va danh, ban hanh
va cam » va cham, va cac, va cao
cua te » cua tu
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 va cam xuc ((va hanh) OR (van hanh)) dai ((dua tren) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu va cam xuc ((va hanh) OR (van hanh)) dai ((dua tren) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu va cam xuc ((va hanh) OR (van hanh)) dai ((dua tren) or (cua te))*.