My websites is Thai sites (non-english), I'm not sure google can be know or understand my websites in Thai. Can be explain about my websites structure in English by micro data?
I think explain my websites in English is easy than Thai.
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If Google wouldn't be able to understand your Thai content, so it wouldn't be able too, to rank it and to show it like a search result. So, for first, be sure, it understands your site.
For the second, you should explain the meaning of your site in the site's language. So, if your use Schema.org's inline markup, something like
<span itemprop="description">Description Text</span>, so write your description text in Thai. But write
itemrpop="description"in english ;)