Perhaps you should try some spelling variations:
"et integral formulation" » "et lineal formulacion", "e integral formulation", "de integral formulation", "la integral formulation"
"_ integral formulation" » "_ lineal formulacion", "e integral formulation"
"path anexo formulacion" » "path lineal formulacion", "path de formulacion", "path una formulacion", "parte anexo formulacion", "pais anexo formulacion", "paz anexo formulacion"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"path anexo formulacion\") OR (((\"et integral formulation\") OR (\"_ integral formulation\"))))~".
• Removing quotes may allow a broader search: (( path anexo formulacion ) OR ((( et integral formulation ) OR ( _ integral formulation ))))~.
• Adding a wildcard symbol may retrieve word variants: (("path anexo formulacion") OR ((("et integral formulation") OR ("_ integral formulation"))))*.