Perhaps you should try some spelling variations:
multiling » multilingue
multilingues » multilingueues, multilingue
multilinguismo » multilingueuismo, multilingualism, multilingumismo, multilinguistmo, multilinguiso
{uml}ismo." » {uml}mismo.", {uml}istmo.", {uml}iso."
{uml}sismo." » {uml}smismo.", {uml}sistmo.", {uml}siso.", {uml}sismos.", {uml}mismo.", {uml}simo."
{uml}iistmo." » {uml}istmo.", {uml}iismo."

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