Your question is not quiet clear to me. Do you want to search for publications by others, or do you look for journals to publish your own research? In the first case, please note that ResearchGate's search function is rather elementary, it is not possible to do a sophisticated search. See https://help.researchgate.net/hc/en-us/articles/14292986311825-Discovering-and-requesting-research for some instructions. In the second case, please note that ResearchGate is not a publisher and does not have any journals for publication, i.e. you cannot "publish" a paper here. It is a platform for books or for papers published in journals, or to present unpublished texts, data etc. See also "Is ResearchGate a publisher?" in https://help.researchgate.net/hc/en-us/articles/14292596164753.
Please note also that you wrote to the ResearchGate community, not to the RG team.