Rank one at Google search engine in Taiwan

My website (keyword: Michael Wu) is ranked the first one at Google search engine in Taiwan among the 27,600,000 results. However, when you key in my Chinese name 吳文舜, my website has not been ranked the first one as it was before. :-(

Google search

Google search
Originally uploaded by MichaelWu.

If you type my Chinese name in Google, you can find my personal website listed the first one. What surprises me is that I don't use my Chinese name in my English website. It's amazing.