The most emailed article on nytimes.com today is an article about better searching (oh, if only that were always true!). The author lists "10 Simple Google Search Tricks" to help improve your Googling. A lot of the tips work well for other databases and search interfaces as well, like the perennial librarian favorites: Boolean operators. Use an OR in capital letters and then a related word to expand your search, or a NOT (in Google's case, a "-") to exclude terms you don't want to see in your results. For other tips, like limiting document types or number ranges, the specific Google syntax may not work in a database like PubMed or PsycINFO, but keep as eye out for "Limits", usually checkboxes or drop-down menus that can give a lot of specific options, depending on which database you're in.