Perhaps you should try some spelling variations:
april technical » all technical, prime technical, crl technical
apis technical » api technical, apps technical, basics technical
gis technical » fips technical, aws technical, files technical

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 ((gis technical) OR (apis technical)) paper ) OR ( world april technical papers )).
• Adding a wildcard symbol may retrieve word variants: (( world ((gis technical) or (apis technical)) paper ) or ( world april technical papers ))*.