Perhaps you should try some spelling variations:
"motor skills series." » "motor skills surveys.", "motor skills service.", "motor skills studies.", "labor skills series."
"motor soil surveys." » "motor social surveys.", "motor school surveys.", "motor skills surveys.", "monitor soil surveys.", "motor skill surveys.", "poor soil surveys."
"poor topical surveys." » "poor medical surveys.", "own topical surveys.", "poor local surveys."

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 ((("motor soil surveys.") or ("poor topical surveys."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("motor skills series.") OR ((("motor soil surveys.") OR ("poor topical surveys."))))*.
• Removing quotes may allow a broader search: (( motor skills series. ) or ((( motor soil surveys. ) or ( poor topical surveys. ))))*.