Perhaps you should try some spelling variations:
technological frontier » technology frontier
frontier information » further information, premier information, other information
information des » information does, information der, information due
l developpement » le developpement, de developpement, et developpement
des fils » des films, des mils, des nils
a l » a la
mass » maps

You may be able to get more results by adjusting your search query.

• Adding a wildcard symbol may retrieve word variants: technological frontier information des fils mass communication a l developpement _ america.*.