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

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 multilingues)({uml}ismo." or (({uml}sismo." OR {uml}simo.") or {uml}sismos."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "\"(multiling or multilingues)({uml}ismo.\" or (({uml}sismo.\" OR {uml}simo.\") or {uml}sismos.\"))~".
• Removing quotes may allow a broader search: (multiling or multilingues)({uml}ismo. or (({uml}sismo. OR {uml}simo. ) or {uml}sismos. ))~.
• Adding a wildcard symbol may retrieve word variants: "(multiling or multilingues)({uml}ismo." or (({uml}sismo." OR {uml}simo.") or {uml}sismos."))*.