Google has taken to looking at your search terms and deciding what you really want is something else. All I can think of is that I use search terms that, based on my 40 years in the software business, will give results using a simple text comparison, but in fact AI analyses the terms as though I said them to another human and comes up with different criteria. Another possibility is that they dork up the results until you log in. Maybe someone with a google account can speak to that. Anyway, DDG is working well for me and I avoid google whenever I can.
I have used startpage for years, but they use the google engine. Naked google searches are now very limited.