Where can I get oversea ingredients in the US?

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One of the ingredients we're looking for is called Phụ gia bánh mì. We live in Wisconsin but close to the Twin Cities. If there isn't a way to get in the US, what are some good alternatives? Thank you.

 

 

 

Local or regional ethnic grocery store?  Have you called around to find out if it is available from grocery importers? 

When I ask Google Translate I get "Bread Improver". I'm guessing just about any brand would give similar results.