Generally, I would suggest that you post this question to the Language API forum, but in this case, I think the answer is simple enough. Yes, you need to make sure that your Chinese source string is encoded correctly. More specifically, you need to URL encode it. So in PHP (which you seem to be using), you would pass ...q=' . urlencode($ChineseCharacterHere)...
Hope that helps.
jg
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Jeremy R. Geerdes
Generally Cool Guy
Des Moines, IA
If you're in the Des Moines, IA, area, check out Debra Heights Wesleyan Church!