Perhaps you should try some spelling variations:
multiling » multilingue, multilingues
multilinguismo » multilingueuismo, multilinguesuismo, multilingualism, multilingumismo, multilingusismo, multilinguistmo
{uml}ismo." » {uml}mismo.", {uml}sismo.", {uml}istmo."
{uml}iismo." » {uml}imismo.", {uml}isismo.", {uml}iistmo.", {uml}mismo.", {uml}sismo.", {uml}itsmo."
{uml}smismo." » {uml}smmismo.", {uml}smsismo.", {uml}smistmo.", {uml}asimismo."

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 multilinguismo)(({uml}ismo." or {uml}iismo.") or {uml}smismo.")~.
• If you are trying to use Boolean operators, they must be ALL CAPS: "(multiling or multilinguismo)(({uml}ismo." OR {uml}iismo.") or {uml}smismo.").
• Removing quotes may allow a broader search: (multiling or multilinguismo)(({uml}ismo. or {uml}iismo. ) or {uml}smismo. ).
• Adding a wildcard symbol may retrieve word variants: "(multiling or multilinguismo)(({uml}ismo." or {uml}iismo.") or {uml}smismo.")*.