Perhaps you should try some spelling variations:
"international airways economics series" » "international waterways economics series", "international gateways economics series", "international railway economics series", "international waterways economic series", "international airline economics series", "international aids economics series"
"international self autonomy states" » "international sale autonomy states", "international silk autonomy states", "international sales autonomy states", "international self autonomy notes", "international self autonomy shared", "international self autonomy step", "international user autonomy states"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("international self autonomy states") or ("international airways economics series"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international self autonomy states") OR ("international airways economics series")).
• Removing quotes may allow a broader search: (( international self autonomy states ) or ( international airways economics series )).
• Adding a wildcard symbol may retrieve word variants: (("international self autonomy states") or ("international airways economics series"))*.