Perhaps you should try some spelling variations:
"especies quimicas public." » "especies exoticas public."
"serie politicas publica." » "serie politicas publicas.", "serie politicas publicad.", "serie politica publicas.", "serie policiaca publica."
"sobre politica publica." » "sobre politicas publicas.", "sobre politicas publica."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("especies quimicas public.") or ((("serie politicas publica.") or ("sobre politica publica."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("especies quimicas public.") OR ((("serie politicas publica.") OR ("sobre politica publica."))))*.
• Removing quotes may allow a broader search: (( especies quimicas public. ) or ((( serie politicas publica. ) or ( sobre politica publica. ))))*.