Perhaps you should try some spelling variations:
school surveys » school survey
skills series » skills surveys, skills service, skills studies
motor skills » labor skills
soil surveys » social surveys, skills surveys, point surveys
motor school » major schools, after school, labor school
motor soil » monitor soil, motor skill, poor soil

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: (( motor skills series. ) OR ((( motor soil surveys. ) OR ( motor school surveys. ))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( motor skills series. ) or ((( motor soil surveys. ) OR ( motor school surveys. ))))~".
• Adding a wildcard symbol may retrieve word variants: (( motor skills series. ) or ((( motor soil surveys. ) OR ( motor school surveys. ))))*.