If you get no results from a search, try a less specific search (eg, fewer words if possible).
Putting "double quotes" round a phrase will search for the words only in that order. A link (and its title and/or comment) must contain all the searched-for words to be displayed in the search results.
You can restrict the dates searched by changing the default dates given (there are no links from before 1999-09-01). To find all links posted between any dates, leave the "Search for" field empty.
If you still have trouble finding something you think is in there, email me and I'll see if I can help.