Click the 'Search' box (1) at the top of the page, type in a word or phrase and click the magnifying glass.  

To look for a specific publisher or type of announcement, use the filter (2) which appears after clicking the search box. Select the categories or fill-in the publisher name, location or publish from date and click Search. It is possible to use multiple criteria for one search; leaving a field blank/unchecked will search for all.

To clear any applied filter, click 'Clear filter' on top of the page(3). Or click on the Champ logo.