Perhaps you should try some spelling variations:
"et lineal formulacion" » "et la formulacion", "et una formulacion", "et anexo formulacion", "en linea formulacion", "_ lineal formulacion", "ex linea formulacion"
"en lineas formulacion" » "en la formulacion", "en una formulacion", "en anexo formulacion", "en linea formulacion", "de lineas formulacion", "y lineas formulacion"
"path integral formulation" » "parte integral formulation", "et integral formulation", "la integral formulation"

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 integral formulation\") OR (((\"et lineal formulacion\") OR (\"en lineas formulacion\"))))~".
• Removing quotes may allow a broader search: (( path integral formulation ) OR ((( et lineal formulacion ) OR ( en lineas formulacion ))))~.
• Adding a wildcard symbol may retrieve word variants: (("path integral formulation") OR ((("et lineal formulacion") OR ("en lineas formulacion"))))*.