Perhaps you should try some spelling variations:
"frozen sampling" » "from sampling", "driven sampling", "frozen samples"
"token sampling" » "modern sampling", "pollen sampling", "down sampling"
"token jumping" » "lakes jumping", "maker jumping", "mode jumping"
"ski jumping" » "skin jumping", "skip jumping"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("ski jumping") OR ((("token jumping") OR ((("token sampling") OR ("frozen sampling")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"ski jumping\") or (((\"token jumping\") or (((\"token sampling\") OR (\"frozen sampling\"))))))".
• Removing quotes may allow a broader search: (( ski jumping ) or ((( token jumping ) or ((( token sampling ) OR ( frozen sampling )))))).
• Adding a wildcard symbol may retrieve word variants: (("ski jumping") or ((("token jumping") or ((("token sampling") OR ("frozen sampling"))))))*.