Search by tag [x] OR [Y]
4953
Search [tag1] OR [tag2]
52223
How to search questions with only one specific tag?
147681
Does Google have an || (or)? Particularly for searching particular sites?
98192
Can't search unanswered questions with multiple tags
1465
Search for tags only redirect from search page
96267
How to check if post has any tag?
3381
Search all tags with no tag wiki
151241
A real solution to ambiguous tags
35575
Automatic tag suggestions
129301
Need to perform Wildcard (*,?, etc) search on a string using Regex
137870
Autocomplete tags in search box
88134
Tag search NOT operator is broken
117416
How do I select a question with particular tags?
26257
PHP: Search for a string in XML
115612
Distinguish synonyms from single-tag questions on the /tags page
143563
Multiple tag search using OR operator broken for logged out users
15680
jQuery selector regular expressions