Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
bo sach » co sach, hoc sach
hieu ve » hieu van
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
va hanh » va thanh, va danh, ban hanh
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di cua
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.

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach y nang x hoi. ((hieu ve) or (hieu va)) cam duc ((va hanh) OR (van hanh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach y nang x hoi. ((hieu ve) OR (hieu va)) cam duc ((va hanh) OR (van hanh)) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach y nang x hoi. ((hieu ve) or (hieu va)) cam duc ((va hanh) OR (van hanh)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: bo sach y nang x hoi. ((hieu ve) or (hieu va)) cam duc ((va hanh) OR (van hanh)) vi cua te*.