Perhaps you should try some spelling variations:
"path una formulacion" » "path la formulacion", "path de formulacion", "path su formulacion", "pat una formulacion"
"path y formulacion" » "path la formulacion", "path de formulacion", "path y formacion", "pat y formulacion"
"paths y formulacion" » "paths la formulacion", "paths de formulacion", "paths y formacion", "pates y formulacion", "paths _ formulacion", "pats y formulacion"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("path una formulacion") OR ((("path y formulacion") OR ("paths y formulacion"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"path una formulacion\") OR (((\"path y formulacion\") OR (\"paths y formulacion\"))))*".
• Removing quotes may allow a broader search: (( path una formulacion ) OR ((( path y formulacion ) OR ( paths y formulacion ))))*.