I am absolutely sure that Asian words cannot be displayed in a Western European encoding!
You must first “Save as…” your edited document as a Unicode one. I would strongly recommend UTF-8 (with or without “signature”). The “encoding” drop-down list is to the left of the “Save” button.
There are many excellent Unicode introductory pages. My favorite is Joel on Software: About Unicode and Character Sets
I hope it helps. Good Luck!