Perhaps you should try some spelling variations:
"international policy economic surveys" » "international poverty economic surveys", "international prices economic surveys", "national policy economic surveys", "international policy economic studies", "international policy economic systems"
"International policy economic services" » "International policy economics series", "International policy ecological services", "International policy economic studies"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("International policy economic services") OR ("international policy economic surveys"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"International policy economic services\") OR (\"international policy economic surveys\"))*".
• Removing quotes may allow a broader search: (( International policy economic services ) OR ( international policy economic surveys ))*.