Why need?
Mobile input, long product names and unknown brands increase the likelihood of typing errors.
Glossary
Typo Tolerance
Typo Tolerance is the ability of search to show actionable results when a visitor types a word wrong.
Not every deviation is a mistake
New brands, professional terms and SKUs should not be automatically corrected to a known word.
Context helps
Catalogue words, word length and exact identifiers can determine how much tolerance is safe.
Measuring
Check that corrections lead to better clicks and fewer real zero-result searches, not just to more results.