Perhaps you should try some spelling variations:
technical paper » technical papers
apis technical » api technical, apps technical, basics technical
app technical » ntp technical, 2 technical, 7 technical
world apis » world apps, world anis, world kpis
world app » world a, world ai

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