Perhaps you should try some spelling variations:
"radio science series a:, life sciences" » "radio science services a:, life sciences", "radio science stories a:, life sciences", "radio science theories a:, life sciences"
"radio voice services a:, life sciences" » "radio voip services a:, life sciences", "radio core services a:, life sciences"

Try widening your search to All Fields.

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: (("radio science series a:, life sciences") OR ("radio voice services a:, life sciences")).
• Removing quotes may allow a broader search: (( radio science series a:, life sciences ) or ( radio voice services a:, life sciences )).
• Adding a wildcard symbol may retrieve word variants: (("radio science series a:, life sciences") or ("radio voice services a:, life sciences"))*.