You've got to find a civ which is friendy with you, and use the correct tone of voice.
This has worked fine for me so far. I've exchanged maps many times, and advances a lot more.
Trading will usually be with a civ that is roughly equal in power, so I think the 'friendly' tone of voice is best. Also the order which the exchange is worded in (i.e. offer-request vs. request-offer) is important.
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phoenixcager
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