Perhaps you should try some spelling variations:
kpis technical » apps technical, gis technical, clis technical
apis technical » api technical, apps technical, basics technical
world mario » world marie, world marine, world martin
world mali » world marie, world malte, world map

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 ((kpis technical) OR (apis technical)) paper ) OR ( ((world mali) OR (world mario)) technical papers )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( world ((kpis technical) or (apis technical)) paper ) or ( ((world mali) OR (world mario)) technical papers ))".
• Adding a wildcard symbol may retrieve word variants: (( world ((kpis technical) or (apis technical)) paper ) or ( ((world mali) OR (world mario)) technical papers ))*.