Perhaps you should try some spelling variations:
multiling » multilingue
multilingues » multilingueues, multilingue, multilinguismo
multilingueues » multilingueueues, multilingue, multiligues
{uml}sismo." » {uml}mismo.", {uml}simo."
{uml}sismos." » {uml}mismos.", {uml}simos."
{uml}sistmo." » {uml}istmo.", {uml}sisto."

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) or multilingueues)({uml}sismo." OR ({uml}sistmo." or {uml}sismos."))~.
• Removing quotes may allow a broader search: ((multiling or multilingues) or multilingueues)({uml}sismo. or ({uml}sistmo. or {uml}sismos. ))~.
• Adding a wildcard symbol may retrieve word variants: "((multiling or multilingues) or multilingueues)({uml}sismo." or ({uml}sistmo." or {uml}sismos."))*.