Perhaps you should try some spelling variations:
van nang » van quang, van ban, van dong
va thanh » gia thanh, ban thanh, va tinh
so sach » so sanh, bo sach, co sach
vu nang » vuc nang, va nang, vu dang
hieu va » lieu va, hieu qua
va hanh » van hanh, va danh, ban hanh
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua

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 ((vu nang) or (van nang)) xa hoi. hieu va cam xuc ((va hanh) OR (va thanh)) vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((vu nang) OR (van nang)) xa hoi. hieu va cam xuc ((va hanh) OR (va thanh)) vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((vu nang) or (van nang)) xa hoi. hieu va cam xuc ((va hanh) OR (va thanh)) vi cua vat".
• Adding a wildcard symbol may retrieve word variants: so sach ((vu nang) or (van nang)) xa hoi. hieu va cam xuc ((va hanh) OR (va thanh)) vi cua vat*.