Perhaps you should try some spelling variations:
lineal formulacion » la formulacion, una formulacion, anexo formulacion
de integrales » e integrales, de interes, e integral
parte lineal » parte general
de intereses » de interes
formulation\" » formation\", reformulacion\", formulaciones\"

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: "\"((\\"parte lineal formulacion\\") OR (\\"((de integrales) OR (de intereses)) formulation\\"))\"".
• Removing quotes may allow a broader search: (( parte lineal formulacion ) OR ( ((de integrales) OR (de intereses)) formulation )).