Perhaps you should try some spelling variations:
multiling » multilingue
multilingues » multilingueues, multilingue, multilinguismo
{uml}sismo." » {uml}sismos.", {uml}sistmo.", {uml}siso."
{uml}mismo." » {uml}mistmo.", {uml}miso."
{uml}ismo." » {uml}istmo.", {uml}iso."
{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}sismo." OR {uml}mismo.") OR {uml}ismo.") or {uml}simo.")~.
• Removing quotes may allow a broader search: (multiling or multilingues)((({uml}sismo. OR {uml}mismo. ) or {uml}ismo. ) or {uml}simo. )~.
• Adding a wildcard symbol may retrieve word variants: "(multiling or multilingues)((({uml}sismo." OR {uml}mismo.") or {uml}ismo.") or {uml}simo.")*.