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

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