Perhaps you should try some spelling variations:
van nang » van quang, van ban, van dong
van hanh » van thanh, ban hanh, van anh
so sach » so sanh, bo sach, co sach
cam duc » cam xuc, cao duc, pham duc
va hanh » va thanh, va danh, ban hanh
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
di cua » dai cua, doi cua, de cua
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: so sach ((y nang) or (van nang)) x hoi. lieu va cam duc ((va hanh) OR (van hanh)) di cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((y nang) OR (van nang)) x hoi. lieu va cam duc ((va hanh) OR (van hanh)) di cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((y nang) or (van nang)) x hoi. lieu va cam duc ((va hanh) OR (van hanh)) di cua vat".
• Adding a wildcard symbol may retrieve word variants: so sach ((y nang) or (van nang)) x hoi. lieu va cam duc ((va hanh) OR (van hanh)) di cua vat*.