You can search for multiple concepts in Daylight, but please keep in mind:
1. When you search for two terms at once, Daylight searches for EITHER term.
2. Currently, you cannot search for two terms at once and obtain search results that are based on the intersection of both terms, or as concept 1 AND concept 2.
However, you can use the axes overlay feature to set an X- or Y- axis for a saved topic and use the Galaxy to visualize the concepts that intersect (upper-right quadrant).
3. UNLESS it's a "collocation" which is a short phrase that recurs frequently in the data set as a single concept, such as "watch movies" - "highly recommend" - "power button" - "happy with my purchase" or "gift for my husband."