The Yippy Clustering Search Engine supports an advanced query syntax much like the other major search engines:

AND

By default, Clusty only returns results that contain all of your search terms. It is not necessary to enter AND between search terms.

OR

Finds documents containing at least one of the specified words or phrases. Pumpkin OR pie finds documents containing either pumpkin or pie. The documents returned may contain both words, but won't necessarily contain both words.

NOT or -

Excludes documents containing the specified word or phrase. Pumpkin -pie finds documents with the word pumpkin but not with the word pie.

" " (quotation marks)

Finds documents containing the exact phrase in quotations. The search "pumpkin pie" would find documents containing this exact phrase rather than any occurrence of the word pumpkin or pie.

site:domainname

Finds pages within the specified domain. Use site:fr to find pages from France, or use site:edu to find pages from educational sites.

site:sitename

Finds pages from a specific site. The search site:nytimes.com would find pages whose host name contains nytimes.com.

filetype:type

Finds pages of a particular file type (e.g., .doc, .xls, .ppt). For example, adding filetype:xls to your search terms will only produce Excel documents.

Yippy ignores capital letters. Pumpkin Pie produces the same result as pumpkin pie or PumPKin PiE.