Perhaps you should try some spelling variations:
multiling » multilingue
multilingues » multilingueues, multilingue, multilinguismo
{uml}iismo." » {uml}sismo.", {uml}itsmo.", {uml}uismo.", {uml}isismo.", {uml}iistmo.", {uml}iiso."
{uml}ismo." » {uml}sismo.", {uml}istmo.", {uml}iso."
{uml}mismo." » {uml}msismo.", {uml}mistmo.", {uml}miso."
{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}iismo." or ({uml}ismo." OR {uml}mismo.")) or {uml}simo.")~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "\"(multiling or multilingues)(({uml}iismo.\" or ({uml}ismo.\" OR {uml}mismo.\")) or {uml}simo.\")~".
• Removing quotes may allow a broader search: (multiling or multilingues)(({uml}iismo. or ({uml}ismo. OR {uml}mismo. )) or {uml}simo. )~.
• Adding a wildcard symbol may retrieve word variants: "(multiling or multilingues)(({uml}iismo." or ({uml}ismo." OR {uml}mismo.")) or {uml}simo.")*.