In the past we used to have options on the search window to search MHF,
Mathworld or Wikipedia, which we no longer have.

Now I never had much success searching for threads on MHF that I knew
existed using the MHF option, so there is no great loss in it no longer being
available. But I still have a requirement to search for threads that I know
exist.

The strategy that I have developed to do this is to use Google with a
string such as "mathhelpforum captainblack ketword1 keyword1 ..." Now as
the search engines are cataloguing what is posted here every 10 days or so
this should turn up the thread/s of interest if they are old enough.

Experiment shows that this strategy works rather well (at least for me).

RonL

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Truth does not change because it is, or is not, believed by a majority of the people.

Giordano Bruno