[This feature is already available (although rather buried at the moment) via the Search box on the map-only embeds.
For example, here's the visual search result for
Biofuels (sorted by map) – and you can use the search box at the bottom to carry out other searches.
The initial implementation is rather rudimentary – and, in its current form, the utility is strongest when using less rather than more common terms; however, in principle, it should be straightforward to surface this search option in the main interface – and I would welcome feedback on this idea (and its relative priority)].