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

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

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