To search the thesaurus:
You can run separate searches, each on a different theme, and then combine the two sets of results. To do this:
1. Click Recent Activity in the left-hand column. Here you'll find a list of the searches you've run in your current search session. Tick or select the box next to each search that needs to be combined.
2. Click the 'combine' icon (to the right of the 'down arrow' icon).
3. Select one of the following options:
AND: select this to create a single set of overlapping results (i.e. a set in which each result appears in each of the previous sets that you're combining). This is useful where each previous set represented a different theme and you want a set in which each result represents all of those themes.
OR: select this to create a single set of results that lists every single search result from across all of the sets that you're combining (i.e. not just the overlapping results that appear in multiple sets).
4. A number identifying each precious search appears in the single search box near the top of the screen (e.g. S1 AND S2; S3 OR S6 etc). Finally, click 'Search' to retrieve your combined set of results.