...
When no results are found the auto-suggest box will display:
the text No <items> were found (e.g. categories, employees etc.).
suggestions for improving the search, for example:
Make sure all words are spelled correctly.
Try different or fewer keywords.
When possible, provide specific solutions suited to the specific database. For example, when searching for employees, recommend searching by ID or employee number.
Spelling
...
errors
Misspelled queries should be auto-corrected to the best known query, while allowing the user to revert to the original query:
...