You should be able to search using a description but you cannot filter using a description.
Refer to Filtering vs Searching.
Both filtering and searching will let you find cards assigned to particular members, labels, or boards. Only searching will search for terms across several boards, or card descriptions.
However, also consider using labels to group cards that are related (belong together).
If you had to thrive a new habit during a lockdown, what would it be? Trello
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