"multi topic" is correct and usable in written English
You can use it to refer to a situation or conversation that covers multiple topics. For example, "The conversation at the dinner party was multi topic, ranging from the upcoming election to the latest Netflix series."
From 2014 NSA is planning to combine all national surveys into a continuously on-going Multi-Topic-Household Survey that will provide regular data up-dates on poverty and unemployment.
In the course of the multi-topic survey, each interviewee was asked questions on six topics.
Applying information retrieval (IR) techniques directly to long or multi-topic documents often does not lead to satisfactory results.
In related meta-review site news, the multi-topic review search engine iNods (see Mike's review) released their 1.0 version today.
Furthermore, the multi-topic survey contributed at least partly to the required "blinding" of the topic and helped to minimize a recall bias [46].
This multi-topic procedure contributed at least partly to the blinding of the topic of special interest among the interviewees and the interviewers.
The LSMS in Morocco is a multi-topic household survey covering a wide range of topics that are related to the Moroccan population.
Household definitions used in multi-topic household surveys vary between surveys but have potentially significant implications for household composition, production, and poverty statistics.
These cross-sectional surveys were conducted as face-to-face multi-topic interviews, quarterly in three waves in the months of March, June, September, and November/December from 1995 through 2009.
A series of co-crystallization experiments were performed using four multi-topic N-heterocyclic acceptor molecules and nine aromatic halogen-bond donors in order to establish how effectively a ranking of bond strength based on calculated molecular electrostatic potential surfaces translates into predictable primary interactions in the solid state.
The cross-sectional data was drawn from the India Human Development Survey IHDSS) [11], a nationally representative, multi-topic survey collected from November 2004 to October 2005.
