Perhaps you should try some spelling variations:
plant technologies » plasma technologies, smart technologies, agent technologies
pnt technologies » ict technologies, art technologies, net technologies
iot technologies » smart technologies

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: (( plant technologies ) OR ( ((pnt technologies) OR (iot technologies)) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( plant technologies ) or ( ((pnt technologies) OR (iot technologies)) ))".
• Adding a wildcard symbol may retrieve word variants: (( plant technologies ) or ( ((pnt technologies) OR (iot technologies)) ))*.