I would like to find in a text corpus (with long boring text), allusions about some pre-defined topic (let's say i am interested in the 2 topic: "Remuneration" and "Work condition").
For exemple finding in my corpus where (the specific paragraph) it is pointing problems about "remuneration".

To accomplish that i first thought about a deterministic approach: building a big dictionary, and thanks to regex maybe flagging those words in the text corpus. It is a very basic idea but i do not know how i could build efficiently my dictionary (i need a lot of words in the lexical field of remuneration). Do you know some website in french which could help me to build this dictionary ?

Perhaps can you think about a more clever approach based on some Machine Learning algorithm which could realize this task (i know about topic modelling but the difference here is that i am focusing on pre-determines subject/topic like "Remuneration"). I need a simple approach :)