Intelligent search on documents in my cloud

My name is Salvatore, I am an Electronics Engineer and I am looking for an artificial intelligence programmer expert in LLM to work with one of my computer engineer collaborators. I don't need online lessons. I need to use LLM APIs that could be LangChain or whatever to train on a folder of files and be able to query them and most likely use something from the open source AI Bloom on my project. I inserted my docx and pdf documents into the cloud. On the site I created a search bar that I use to write what I want to search for in my documents (in italian language). The query/search occurs on all documents and not on one at a time. I want to improve the search in the sense that if I don't write exactly the sentence contained in one of the documents, the database needs to be made intelligent and understand what topic I'm looking for in my documents.