The International Thesaurus of Refugee Terminology

The International Thesaurus of Refugee Terminology (ITRT) is designed to facilitate information retrieval and exchange. In print since 1988, the Thesaurus has proven an essential resource for librarians and information workers. However, the specialized nature of and ongoing evolution in refugee terminology meant that the print editions were soon outdated. In 2002, the UN High Commissioner for Refugees Library and Forced Migration Online (FMO) began discussing how to create a web-based version of the Thesaurus that would be more responsive to the needs of its users.
http://www.refugeethesaurus.org/hms/home.php?publiclogin=1

Use the terms to search databases and library catalogues for a more exact search. For example if your topic is Assimilation according to the thesaurus you might want to try the term Integration as well. If you are researching participation of the refugee in decision making the term is Refugee participation but you might also try the related terms Durable solutions or Refugee assistance.

Enjoy!