A search engine isn't a human being, and spell checkers (or spelling recommendations) are limited in what they can do. For example, if you search on the word "lead," how is Google supposed to know that you mean the metal, and not what a president or prime minister does?
Google's suggestions are just that: suggestions. If they don't work for you, don't use 'em. (I find them helpful myself, not because I'm a poor speller but because I sometimes make typos and don't realize that I've typed "Goerge Washington" for "George Washington" until Google points out the correct alternative.)