(-) Use a minus in front of the word that you want to leave out.
(+) Use a plus in front of the word that you want to have included.
(" ") Use quotes to search for an exact match, e.g. "infant colic".
(*) Use an asterix at the end of a word to include all results starting with the expression, e.g. inf* leads to infant, infantile, infarct, etc. The asterix can also be placed in front of a word to show all results with the exact ending.
If a search result shows only a title it will lead you back to the topic overview.
You can use this shortcut to search for a specific word on each site. Works in almost all desktop browsers.