Hitting maximum keywords with only 4? Search API



I’m wondering if anyone can shed some light on a problem i’m having with the Search API.
Whenever I use more than 2 keyword groups (using +OR+), I’m getting an empty response from Twitter. (Excluding the headers.)

For readability sake i’ve removed URL Encoding from the below URL’s,

Working call
http://search.twitter.com/search.json?q=sivltd+OR+Don Valley Stadium&include_entities=true&result_type=recent&rpp=100&show_user=true

Incorrect call
http://search.twitter.com/search.json?q=sivltd+OR+Sheffield English Institute of Sport+OR+Don Valley Stadium&include_entities=true&result_type=recent&rpp=100&show_user=true

I’m getting zero results with the second call, however if I remove any of the keywords, I will.

Can anyone help?
I’ve read up a lot on the API and as far as I can tell i’m way off the keyword limit.
I’m not affected by rate-limiting at the moment either.

Any help appreciated!


Is the API picky when using common terms such as “of” and “the” in keywords?
Really struggling to figure this out!