Perhaps you should try some spelling variations:
"la lineal formulacion" » "la la formulacion", "la una formulacion", "la anexo formulacion", "la linea formulacion", "lo lineal formulacion", "la liberal formulacion"
"de integral formulation" » "e integral formulation", "de integrales formulation", "de integraca formulation"
"de integrar formulation" » "de integraca formulation", "e integral formulation", "se integra 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 lineal formulacion") OR ((("de integral formulation") OR ("de integrar formulation"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"la lineal formulacion\") OR (((\"de integral formulation\") OR (\"de integrar formulation\"))))".
• Removing quotes may allow a broader search: (( la lineal formulacion ) OR ((( de integral formulation ) OR ( de integrar formulation )))).
• Adding a wildcard symbol may retrieve word variants: (("la lineal formulacion") OR ((("de integral formulation") OR ("de integrar formulation"))))*.