"Turkey, Brazil look to boost trade, partnerships
* Turkey-Brazil trade can grow 300-400 pct
* Trade over $1 billion in 2008
* Petrobras to invest $300 mln by end 2010
By Thomas Grove
ISTANBUL, May 21 (Reuters) - Brazilian President Luiz Inacio Lula da Silva and business leaders visited Istanbul on Thursday to secure a stronger foothold in Turkey's domestic market and make good on its regional ties."
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