LC will be the best way. A Irrevocable 100% LC at sight. Also it depends on whether u re giving on a CNF basis or a ex yards or FOB basis. If u have a good understanding with yr buyer's the its ok to get an advance and balance on BL copy or on weight slip. However, Indian market is not so good now and i strong advise that a CAD or a by submitting documents thru the bank terms are not the best option. Most cash buyers, like us, will prefer to see the goods and load it in front of us. Then doing it on cash terms is not a problem. Most of my deals our of Malaysia is on cash terms and my buyers gives me on cash TT advance. For vietnam and Chian its best to get a confirmed LC. it the most safest way. This applies for bangladesh as well.
Regards Divakaran d
ivakaran(at)dnoir(dot)com
Skype:divakaran.nair