These are some I found in my search history, where I then switched to !g. Not sure if all these examples still fail to produce results with the matching string (but they still seem to have issues, upon a quick glance):
"packages not in the aur"
rake "invalid session id"
"pacman -Qm"
arch "The pgAdmin 4 server could not be contacted"
"previous definition of HTML_NAMESPACE was here"
illustrator "print preview" is darker
systemd Loaded: bad-setting "has a bad unit file setting"
ryantgtg|4 years ago
"packages not in the aur"
rake "invalid session id"
"pacman -Qm"
arch "The pgAdmin 4 server could not be contacted"
"previous definition of HTML_NAMESPACE was here"
illustrator "print preview" is darker
systemd Loaded: bad-setting "has a bad unit file setting"