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", "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 ((("et integral formulation") OR ("et lineal formulacion"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"path integral formulation\") OR (((\"et integral formulation\") OR (\"et lineal formulacion\"))))*".
• Removing quotes may allow a broader search: (( path integral formulation ) OR ((( et integral formulation ) OR ( et lineal formulacion ))))*.