When we talk about connections or associations between two things or people, we often use the phrase "in relation with." However, there are plenty of synonyms that can be used interchangeably with this expression, depending on the context. For instance, instead of saying "this topic is in relation with that issue," you could say "this topic is linked to that issue," "this topic is connected to that issue," or "this topic is related to that issue." Other synonyms for "in relation with" include "in connection with," "in reference to," "with respect to," and "regarding." Choosing the right synonym requires a bit of nuance and attention to detail, but using varied phrasing can improve the clarity and precision of your writing.