Talvez debería tentar con algunhas variantes ortográficas:
concentration problems » concentration profiles, configuration problems, concentration from
concentration pattern » concentration protein, concentration factors, concentration between
version control » erosion control, vibration control, corrosion control
control right » control rights, control light, control flight

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: communication ((concentration pattern) OR (concentration problems)) version control right~.
• Adding a wildcard symbol may retrieve word variants: communication ((concentration pattern) or (concentration problems)) version control right*.