Perhaps you should try some spelling variations:
multiling » multilingues
multilingue » multilinguesue
multilinguismo » multilinguesuismo, multilingualism, multilingmismo, multilingismo, multilingiismo
{uml}uismo." » {uml}mismo.", {uml}ismo.", {uml}iismo."
{uml}sismo." » {uml}sismos.", {uml}mismo."
{uml}simo." » {uml}simon.", {uml}sido.", {uml}sino."

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((multiling or multilingue) or multilinguismo)(({uml}uismo.\" OR {uml}sismo.\") or {uml}simo.\")~".
• Removing quotes may allow a broader search: ((multiling or multilingue) or multilinguismo)(({uml}uismo. OR {uml}sismo. ) or {uml}simo. )~.
• Adding a wildcard symbol may retrieve word variants: "((multiling or multilingue) or multilinguismo)(({uml}uismo." OR {uml}sismo.") or {uml}simo.")*.