Perhaps you should try some spelling variations:
"cross domestic product" » "gross domestic product", "crisis domestic product", "scrofa domestic product", "cross domestic products"
"crops domestic product" » "gross domestic product", "europe domestic product", "crisis domestic product", "crops domestic products"

Try widening your search to All Fields.

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: "((\"cross domestic product\") OR (\"crops domestic product\"))".
• Removing quotes may allow a broader search: (( cross domestic product ) OR ( crops domestic product )).
• Adding a wildcard symbol may retrieve word variants: (("cross domestic product") OR ("crops domestic product"))*.