Boolean operators AND, OR, AND NOT can be written in lowercase or uppercase letters.
Sequentially written words is the AND operation:
wind power is the same as wind AND power
sensor W/15 robot AND water OR orbit OR planet
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finland or finnish and pisa is the same as (finland or finnish) and pisa
(wind OR solar) AND (power OR energy)
(robot* w/2 hand) OR (robot* pre/3 arm)
(game* OR gamif* OR gaming OR videogam* OR exergam* OR edugam*) AND (language* OR linguistic* OR pronunciat* OR vocabular*) AND (learn* OR acquisit* OR educat* OR teach* OR student*)