Quotes make it only return results that contain exactly what’s in the quotes. All you need to do is put a string in your website that is unique to all indexed pages. Since there’s no length limit (well, google searches have a max length, but it’s pretty long), I expect that the vast majority of web pages will have some phrase you can use like this.

In theory, you could just search for the entire contents of a page in quotes and it’ll be the only thing that pops up unless another page is identical or contains an identical copy of the first page within it.