Perhaps you should try some spelling variations:
multiling » multilingues
multilingue » multilinguesue
{uml}ismo." » {uml}mismo.", {uml}istmo.", {uml}iso."
{uml}sismo." » {uml}smismo.", {uml}sistmo.", {uml}siso.", {uml}mismo.", {uml}simo."
{uml}sismos." » {uml}smismos.", {uml}sistmos.", {uml}sisos.", {uml}mismos.", {uml}simos."
{uml}sistmo." » {uml}istmo.", {uml}sisto."

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: "(multiling OR multilingue)({uml}ismo." or (({uml}sistmo." OR {uml}sismo.") or {uml}sismos."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "\"(multiling or multilingue)({uml}ismo.\" or (({uml}sistmo.\" OR {uml}sismo.\") or {uml}sismos.\"))~".
• Removing quotes may allow a broader search: (multiling or multilingue)({uml}ismo. or (({uml}sistmo. OR {uml}sismo. ) or {uml}sismos. ))~.
• Adding a wildcard symbol may retrieve word variants: "(multiling or multilingue)({uml}ismo." or (({uml}sistmo." OR {uml}sismo.") or {uml}sismos."))*.