Afaik a lot of android devices suffers from this issue not being able to see ad hoc connections.

There's some workarounds though. I'm not sure wether it's as an .apk or patch and I think you need root access to do it.

Google it, I did at some point as I tried to get nitdroid on my N900 to detect my tethering from my N9. Didn't give it much try nor time cause I went fir nitdroid on my N9.

Regards Dousan...

e: maybe there's even an app on play store to do this...

e2: try out this link, it's a drag to do and seems like it has to be done every time you reconnect. It didn't work for me on my N900. It was shown as detected but couldn't connect as it was out of range.

http://forum.xda-developers.com/show....php?t=1427207