Perhaps you should try some spelling variations:
"del science food ver" » "del science from ver", "del science mad ver", "del science mind ver", "del paciente food ver"
"del science book new" » "del science from new", "del science vol new", "del paciente book new", "del science look now"
"open science book over" » "open science from over", "open science vol over", "en sciences book over", "new science book over"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("del science food ver") OR ("del science book new"))) OR ("open science book over"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"del science food ver\") OR (\"del science book new\"))) OR (\"open science book over\"))".
• Removing quotes may allow a broader search: (((( del science food ver ) OR ( del science book new ))) OR ( open science book over )).
• Adding a wildcard symbol may retrieve word variants: (((("del science food ver") OR ("del science book new"))) OR ("open science book over"))*.