This new Community framework's search feature doesn't seem mature yet. In the last weeks, I experienced cases where the more words you put in the search bar, the more results you got, as it keywords where ORed rather than ANDed. I can't reproduce this now.
However, the "-" exclusion feature does not seem to work. For example, in i.MX Processors forum (https://community.nxp.com/t5/i-MX-Processors/bd-p/imx-processors), if you type "QSPI -DDR", you get 5000 results, the first one having DDR in the title. Clearly not working to exclude "DDR" term... In fact, that's even more results than for "QSPI" alone (1000).
Things to be tuned-up by Community's administrator?