I have other sub domains created before buying this apmart.com domain, namely:

1. wp.binh.name - WordPress resources
2. webdesign.binh.name - Web Design
3. seo.binh.name - Search Engine Optimization
4. cntt.binh.name - CNTT (not worth mentioned).

None of those sub domains are indexed in Google. However, found out they are indexed by Yahoo!.

Those 4 sub domains are part of a PageRank 4 site binh.name. Got linked from binh.name, and linked from some high PR forums. Then why they still are not indexed.

Why sub domains are not indexed?

What I can think of for now, is that I did submit all those subdomains to both Yahoo! Site Explorer, and Google Webmaster Tools. I thought Google is quick at picking up new sites via links. But my theory seem to be incorrect.

A possible reason why my subdomains are not being indexed by Google, is because cntt.binh.name was setup to fetch RSS feeds from news sites, and it's in Vietnamese. Google might be discriminating the duplicated contain from this sub domain, and has put my whole domain into sandbox. I think about this because my last post Major Changes is not indexed by Google.

Another possible reason, is that I recently changed my site title from "SEO Web Designer Binh Nguyen" into "SEO Web Design by Binh", and modified the description a little bit.

Other reasons might be of keyword stuffing. I may be having too many "repeated keywords" on my home page. For me they are not really "repeated" because each of them are unique 3 words, separated by commas. However, Google might take it as repeated single words.

I have to find out about this issue sometimes later on. What do you think it might be?