https://www.google.com.vn/search?q=nhuệm+vụ+của+cách+mạng+miền+bắc+1973-1975&client=safari&hl=vi-vn&sxsrf=ALeKk01apPvnQMVNpdGGeaPM17baNDL4ug%3A1620186826788&ei=yhaSYNveL4HahwPI8Y2wAw&oq=nhuệm+vụ+của+cách+mạng+miền+bắc+1973-1975&gs_lcp=ChNtb2JpbGUtZ3dzLXdpei1zZXJwEAMyBQgAEM0CMgUIABDNAjIFCAAQzQIyBQgAEM0COgQIABBHOgcIIRAKEKABUJ7IAVif4gFgnesBaABwAXgAgAHTAYgB9gaSAQUwLjQuMZgBAKABAcgBCMABAQ&sclient=mobile-gws-wiz-serp