1-What was the result of Zheng He's voyage?
2-what did the europeans trade in Africa?
3-When did the renaissance began?
I went to www.google.com and entered your words -- zheng he's voyage -- and here are the results:
http://www.google.com/search?q=Zheng+He%27s+voyage&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
You can do the same if you enter key search words in Google also.