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

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}ismo." or {uml}mismo.") or ({uml}sismo." OR {uml}sistmo."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: "(multiling OR multilingues)(({uml}ismo." or {uml}mismo.") OR ({uml}sismo." OR {uml}sistmo."))*.
• Removing quotes may allow a broader search: (multiling or multilingues)(({uml}ismo. or {uml}mismo. ) or ({uml}sismo. OR {uml}sistmo. ))*.