How to write a winning bid?

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Hello,I am a freelance writer and translator from Indonesia. I just created account at odesk ( I used to have account at peopleperhour too), but I don't why sometimes it is hard to write a bid that can attract employers. Maybe my skills are not as good as others..only I never work for an international company or media..just do translation for a PR consultancy and used to translate for a media and an outsource company. Can you give sample how to write a good bid that can win a great job? I got my bid accepted at PPH last year..but i had to turn it down as I was still concentrating on my job at the magazine. Now i am working from home and it is time to focus on finding jobs at home. I didn't know what I wrote in my bid at that time. That's why, maybe you can help..thank you