No matter which application you use, everyone who accesses Gnutella has access to the same pool of files provided by the other users but, from minute to minute, users come and go, so the content changes dynamically all the time.

Hence, if you seach for something rare, you might find that only one or two users have that file and so, no matter how many times you search, you will never improve upon that level of availability and everyone will only see those sources. Conversely, if you search for a popular file, you might find one hundred sources in your first search and one hundred different sources for that same file if you were to repeat the serarch one hour later.

Further, because the search returns are limited to avoid overloading Gnutella, and which sources any user hits will be determined by random chance, two different users will never see the same selection of hosts for popular files. Although repeating the searches would, over time, probably enable each user to see all the hosts if they should ever want to do that (which would be a strange desire because you can usually download from the first batch of sources you hit).

So the answer to your question is actually, "It depends."