Perhaps you should try some spelling variations:
"et lineal formulacion" » "et la formulacion", "et una formulacion", "et anexo formulacion", "en linea formulacion", "_ lineal formulacion", "en lineas formulacion"
"path integral formulation" » "parte integral formulation", "et integral formulation"
"la 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 ("la integral formulation"))) OR ("et lineal formulacion"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"path integral formulation\") OR (\"la integral formulation\"))) OR (\"et lineal formulacion\"))".
• Removing quotes may allow a broader search: (((( path integral formulation ) OR ( la integral formulation ))) OR ( et lineal formulacion )).
• Adding a wildcard symbol may retrieve word variants: (((("path integral formulation") OR ("la integral formulation"))) OR ("et lineal formulacion"))*.