Perhaps you should try some spelling variations:
social surveys » topical surveys
skills series » skills surveys, skills service, skills studies
motor skills » labor skills
soil surveys » school surveys, skills surveys, point surveys
math social » death social, cash social, both social
math soil » data soil, each soil

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( motor skills series. ) or ((( math soil surveys. ) OR ( math social surveys. ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( motor skills series. ) OR ((( math soil surveys. ) OR ( math social surveys. )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( motor skills series. ) or ((( math soil surveys. ) OR ( math social surveys. ))))".
• Adding a wildcard symbol may retrieve word variants: (( motor skills series. ) or ((( math soil surveys. ) OR ( math social surveys. ))))*.