different google search results using symbols ș and ț

Good afternoon, I have a question, please tell me this Google does not index the result using the symbol Ș and Ț or the plugin does not convert S and T for it. The fact is what I did with ș and ț and when I made a request for the uși de interior bucurești, we appeared as a result on different devices in different positions, but in general they were, but when I wrote the usi de interior bucuresti, we did not appear in the search results at all. Tell me what the problem is, Google does not give me an answer to this question. And here’s what else I registered a store and set up a SEO for Bucuresti locations, but if you write just uși de interior, we are not in the search results, only if you write uși de interior bucurești, what could be the problem?