I come from this link in SC magazines archive, from which I've recently had a sight to Microhobby magazine (from Brasil) and some of them looks like to be actually unavailable to read and download in PDF, as appear in the list.
Only issues 29 to 33 (included) can't be found at Internet Archive, but I believe they were available some time ago according to covers thumbnails. The message I receive for every one of these issues when accessing corresponding PDF or VIEW says:
I've sent a comment to the guy who uploaded all MH issues (dudasan) at IA. Hope to know something else soon."The item you have requested has a problem with one or more of the metadata files that describe it, which prevents us from displaying this page.
Items may be taken down for various reasons, including by decision of the uploader or due to a violation of our Terms of Use."