Perhaps you should try some spelling variations:
multiling » multilingue
multilingues » multilingueues, multilingue, multilinguismo
{uml}iismo." » {uml}mismo.", {uml}itsmo.", {uml}uismo.", {uml}imismo.", {uml}iistmo.", {uml}iiso."
{uml}ismo." » {uml}mismo.", {uml}istmo.", {uml}iso."
{uml}sismo." » {uml}smismo.", {uml}sistmo.", {uml}siso.", {uml}sismos.", {uml}mismo."
{uml}simo." » {uml}simon.", {uml}sido.", {uml}sino."

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: "(multiling or multilingues)(({uml}iismo." OR {uml}ismo.") or ({uml}sismo." or {uml}simo."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: "(multiling OR multilingues)(({uml}iismo." OR {uml}ismo.") OR ({uml}sismo." or {uml}simo.")).
• Removing quotes may allow a broader search: (multiling or multilingues)(({uml}iismo. OR {uml}ismo. ) or ({uml}sismo. or {uml}simo. )).
• Adding a wildcard symbol may retrieve word variants: "(multiling or multilingues)(({uml}iismo." OR {uml}ismo.") or ({uml}sismo." or {uml}simo."))*.