I cannot tell you how much I hate the new search function. Yes, there are some nice new features that I might use once a month or so, but my daily searching has now become a nightmare so bad that I no longer use the search engine, I just try and find the cache on the map. Except sometimes I can't - an archived cache that I know the name of, the GC code for and the cacher who hid it, yet it does not come up on a search. To look for a cache I just found 5 minutes ago, I have to do an advanced search because nothing I put in the search engine comes up with anything but a DNF. Unknown cache logging is now a total pain because the original coordinates are up to 3 km away (in Adelaide that's a thousand cache icons to check on the map). Multis are impossible to find unless they are next to the starting coordinates.
You either need to issue a users' manual to tell us how to do the things that we used to be able to do so very easily on the old search engine, give us the option of using the old search engine instead of the new one or just admit you stuffed up in a seriously major way and get rid of this turkey of a search engine and give us the old one back.