Perhaps you should try some spelling variations:
"serie estudios espanoles." » "serie estudios espaciales.", "serie judios espanoles.", "serie estudiantes espanoles."
"los estudios urbano." » "los estudios urbanos.", "los estudio urbano.", "los estudios peruanos."
"strikes spain durango." » "strike spain durango.", "shrines spain durango.", "series spain durango.", "strikes spain during.", "strikes espana durango."

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: (((("strikes spain durango.") OR ("serie estudios espanoles."))) OR ("los estudios urbano."))~.
• Removing quotes may allow a broader search: (((( strikes spain durango. ) or ( serie estudios espanoles. ))) or ( los estudios urbano. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("strikes spain durango.") or ("serie estudios espanoles."))) or ("los estudios urbano."))*.