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

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 (\"del science from ver\"))) OR (\"open science book over\"))~".
• Removing quotes may allow a broader search: (((( del science book ver ) OR ( del science from ver ))) OR ( open science book over ))~.
• Adding a wildcard symbol may retrieve word variants: (((("del science book ver") OR ("del science from ver"))) OR ("open science book over"))*.