Find websites that are more relevant to your needs by using the advanced search features in Google
You are researching how stem cells from human embryos might help cure neurological diseases, especially Parkinson's disease
As outlined in the example search in the image below, you can use the following advanced search limiters are used and why:
(click on image to enlarge)
(click on image to enlarge)

The streaming service "Viki" (Korean, Chinese, Japanese, and other Asian TV & films) offers a built in "Learn Mode" that lets viewers see subtitles for their programs in two languages side-by-side.
Note - requires setting up a (free) personal log in with Viki to watch shows and films. (The service has both a free (ad supported) and "Viki Plus" (subscription) tiers.)
When searching YouTube for Japanese culture videos, be aware you'll locate items from a variety of perspectives. Think about what you need and what would be a good or reasonable "authority" for your research:
Example 1: Canadian "vloggers" living in Japan ("What is a Japanese Summer Festival Like?")
Example 2: Asking Japanese people about... (in English) ("How addicted are you to your smartphone?")
Example 3: A two-culture "vlogging" pair ("Japanese Internet Slang" -- Rachel is from the US; Jun is from Japan; their videos alternate perspectives between "what Japanese people don't realize about the US" and "what Americans don't realize about Japan")