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