If you add Dataset Schema.org annotations (see https://support.google.com/webmasters/forum/AAAA2Jdx3sUnPq4BW6iPIA/?hl=en&gpf=%23!topic%2Fwebmasters%2FnPq4BW6iPIA) to dataset landing pages such as http://datasets.datalad.org/?dir=/crcns/cai-1 they will start showing up on https://toolbox.google.com/datasetsearch. You can even add identifiers.org (see #15) for extra measure.
Just remember to use sameAs property to point to the canonical/primary source of each dataset.