From the FAQ:
I don't know how to use search!
- default behavior will return posts with one of each term used, use space to separate terms.
=> vocaloid thread will return posts that include vocaloid and/or thread
- Use "" to search for exact matches.
=> "vocaloid thread" will return posts that include that exact sentence.
- Using multiple words, quoted sentence or other expressions with a pipe "|" will make it return posts that contain one or both of those expressions.
=> vocaloid | thread will return posts that contain either "vocaloid" AND/OR "thread".
- Using - before a word or quoted sentence will remove that from the search results.
=> +"vocaloid thread" -miku will return posts that contain the snipped "vocaloid thread" that don't contain the word "miku".
=> vocaloid | thread -miku -rin will return posts that contain "vocaloid" OR "thread" but that don't have neither "miku" NOR "rin".
If you're unable to understand, just use one of these links and notice the discrepancies: https://archive.nyafuu.org/_/search/text/my
wife chino -is -so -cute/https://archive.nyafuu.org/_/search/text/my
wife chino -"is so cute"/https://archive.nyafuu.org/_/search/text/"my
wife chino" -is -so -cute/https://archive.nyafuu.org/_/search/text/"my
wife chino" -"is so cute"/