Perhaps you should try some spelling variations:
"motor skills surveys." » "motor skills survey.", "motor soil surveys."
"labor skills surveys." » "labor skills survey.", "labor soil surveys."
"small schools survey." » "small schools serve."
"math site surveys." » "math firm surveys."
"math school surveys." » "map school surveys.", "small school surveys.", "smart school surveys."
"math school survey." » "map school survey.", "small school survey.", "smart school survey."
"math social surveys." » "cash social surveys.", "data social surveys.", "health social surveys."

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 surveys.") OR ("labor skills surveys."))) OR ((((((((("math school surveys.") OR ("math school survey."))) OR ("math social surveys."))) OR ("math site surveys."))) OR ("small schools survey."))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"motor skills surveys.\") OR (\"labor skills surveys.\"))) or (((((((((\"math school surveys.\") or (\"math school survey.\"))) or (\"math social surveys.\"))) or (\"math site surveys.\"))) or (\"small schools survey.\"))))~".
• Removing quotes may allow a broader search: (((( motor skills surveys. ) OR ( labor skills surveys. ))) or ((((((((( math school surveys. ) or ( math school survey. ))) or ( math social surveys. ))) or ( math site surveys. ))) or ( small schools survey. ))))~.
• Adding a wildcard symbol may retrieve word variants: (((("motor skills surveys.") OR ("labor skills surveys."))) or ((((((((("math school surveys.") or ("math school survey."))) or ("math social surveys."))) or ("math site surveys."))) or ("small schools survey."))))*.