This engine (still in beta) targets some of the leading international institutions that specialize on migration policy. Be specific with your search terms to ensure you get results on the country & context you are interested in. 

Currently this engine targets the Migration Policy Institute (MPI, Washington D.C., US), Migration Policy Centre (Florence, Italy), International Centre for Migration Policy Development (ICMPD, Vienna, Austria), Centre on Migration, Policy, and Society (COMPAS, Oxford, UK), Centre for Migration Policy Research (CMPR, Swansea, UK), and the Migration Policy Group (MPG, Brussels). 

We are expanding this engine further. Any suggestions? Let us know.