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

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

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