Perhaps you should try some spelling variations:
"card based working paper" » "card base working paper", "card based parking paper", "card basic working paper", "land based working paper", "carbon based working paper"
"world board working papers" » "world word working papers", "world hard working papers", "world world working papers", "world toward working papers", "works board working papers", "world born working papers"

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: "((\"card based working paper\") OR (\"world board working papers\"))".
• Removing quotes may allow a broader search: (( card based working paper ) OR ( world board working papers )).
• Adding a wildcard symbol may retrieve word variants: (("card based working paper") OR ("world board working papers"))*.