Prevent shopping abandonment.
Improve your site search engine to account for synonyms and common misspellings.
Include a statement that clearly acknowledges and apologizes for no results.
Offer suggestions for how to improve their search query.
Include another search bar with a message to try again.
Include a clickable suggestion for misspelled words.
Suggest similar products.
Suggest popular products as an alternative.
Suggest other products based on previous activity for known shoppers.
Offer clickable categories to browse instead.
Offer easy ways to contact customer service.