Perhaps google constantly changes their search engine criteria. Not one of them being perfect yet all together 99% of us cannot identify what they are using. generally I like to look at the date on each hit after a search. and when I see the same site over and over it reinforces its bran in me, it is nice to see recently added.  you have a mixture of old and newer, which tells me you have done this for years- unlike the majority of sites listed in the results. I had not searched for Access2007 training lately because I already found my spot :-)
I just did a search, sorry to say 599cd was not on the first 2 pages. I did use your search criteria - computer training. I'm with you though, on using more specific terms. usually I scan thru 2 – 3 pages of results before I check a site out.
maybe they are using a fisherman’s  algorithm. Say I went fishing this morning and caught a big fish. My friends will want to know where I caught this huge fish. Most likely, next time they go fishing they will hit this spot, as will I. Same goes for 599cd. I found you in a google search. I returned many times. Can’t help but wonder…….