Perhaps you should try some spelling variations:
april technical » all technical, prime technical, crl technical
apis technical » api technical, basics technical
apps technical » app technical, basics technical
world apis » world anis, world kpis, world ai
world apps » world app

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((( world apis technical papers ) OR ( world april technical papers ))) OR ( world apps technical papers )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( world apis technical papers ) OR ( world april technical papers ))) or ( world apps technical papers ))".
• Adding a wildcard symbol may retrieve word variants: (((( world apis technical papers ) OR ( world april technical papers ))) or ( world apps technical papers ))*.