更新1:
The whole sentence is: "Tonight the workers will travel TO BACK their villages bringing the money they've earned this year, which is more than they could earn in ten years at home" ps: it is copied from a novel in a novel competition in Hong Kong.
更新2:
Also, I want to know if it is possible to add one adverbial (back) into another adverbial (to ^ their villages). Can someone quotes some example to elucidate its usage?