Repository search confuses "co-" and "-co"

[m7a]

I would like to provide visitors of my github profile with a means to filter only for those repositories that might be useful to other people. To allow this, I am using a naming convention of having the second letter to be o in relevant repositories, thus I provide a link to the following search:

Link “live demo”: https://github.com/m7a?tab=repositories&q=%22bo-%22+in%3Aname+OR+%22lo-%22+in%3Aname+OR+%22co-%22+in%3Aname+OR+%22wo-%22+in%3Aname

"bo-" in:name OR "lo-" in:name OR "co-" in:name OR "wo-" in:name

Expected

Results display only repositories that contain at least one of bo-, lo-, co- or wo-

Got

Results for all repositories wanted and additionally two unexpected results:

• lp-conf-cli
• lp-cone

Both of them contain -co in their name but none of bo-, lo-, co-, wo-.

Edit: I have reported this to github under https://support.github.com/contact/feedback.