The very first tip is - use the Advanced Search option when searching in Google. It used to be right there but now you just click on the little wheel (options) in the far upper right corner and click "Advanced search." Most likely you can figure out the rest.
a - Click the plus sign next to "Date, usage rights..." to see all of the options.
b- Most important are "Date:" (how recent the page is) and "Where you keywords show up."
This will really improve your results.