The content related to the handwritten newspaper about speaking Mandarin in English can be expres d as: \The content about the handwritten newspaper on speaking Putonghua\
Or
\The r vant content of the handwritten newspaper concerning speaking Mandarin\Another possible expression could be
\The content related to the handwritten newspaper of speaking Mandarin\ The expressions can be u d to describe the topic you mentioned. The choice of which one to u depends on the specific context and your personal preference.
