The reason it doesn't come up when you enter Illinois spelled out is because his profile has the 2 letter abbreviation. Another reason for having the US states not abbreviated, as stated in the locations help pages. If you enter IL only, it comes up. There are many profiles with no location so entering the location, you will be excluding profiles without the location. Entering a date will allow you to see profiles within a 2 year range, I think, but it will exclude people that could be just outside that range that might also match. People weren't always exact on dates. Census had ages only and differed from one year to the next so approximate birth years can be entered.