Yes, it is possible. For example, <https://bugs.launchpad.net/malone/+bugs?field.searchtext=improved> currently returns this bug report, because it has "improved" in the summary. And <https://bugs.launchpad.net/malone/+bugs?field.searchtext=difficult+particular> also currently returns this bug report, because it has the words "difficult" and "particular" in its description.
Can you give a specific example of a bug report, and a search that should find it but doesn't?
Yes, it is possible. For example, <https:/ /bugs.launchpad .net/malone/ +bugs?field. searchtext= improved> currently returns this bug report, because it has "improved" in the summary. And <https:/ /bugs.launchpad .net/malone/ +bugs?field. searchtext= difficult+ particular> also currently returns this bug report, because it has the words "difficult" and "particular" in its description.
Can you give a specific example of a bug report, and a search that should find it but doesn't?