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