I have a multi lingual site. Search results work fine for English, French and German, but for Chinese, Korean and Japanese, no results are returned.

I think maybe I am indexing incorrectly. When I search, if I set supported language to Chinese, I get no results, but if I set supported language to English, I get my Chinese results.

Here is my query:

ar query = this.SearchClient.UnifiedSearchFor(q, Language.English)
	.UsingSynonyms()
	.TermsFacetFor(x => x.SearchSection)
	.FilterFacet("AllSections", x => x.SearchSection.Exists())
	.Filter(x => !x.MatchTypeHierarchy(typeof(MediaData)))
	.Filter(visitorFilter)
	.ApplyBestBets();

Changing the supported language parameter to the actual language returns no results.

How do I ensure I am indexing multiple languages correctly?