Perhaps you should try some spelling variations:
multiling » multilingue
multilingues » multilingueues, multilingue, multilinguismo
{uml}ismo." » {uml}sismo.", {uml}istmo.", {uml}iso."
{uml}mismo." » {uml}msismo.", {uml}mistmo.", {uml}miso."
{uml}mistmo." » {uml}istmo."
{uml}siso." » {uml}sismo.", {uml}sieso.", {uml}sido."

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}mismo." OR {uml}mistmo.")) or {uml}siso.")~.
• Removing quotes may allow a broader search: (multiling or multilingues)(({uml}ismo. or ({uml}mismo. or {uml}mistmo. )) or {uml}siso. )~.
• Adding a wildcard symbol may retrieve word variants: "(multiling or multilingues)(({uml}ismo." or ({uml}mismo." or {uml}mistmo.")) or {uml}siso.")*.