You could try using a glue in a needle delivery system, cut a fine hole with an X-acto knife, insert the glue and use a rubber squeege to smooth it out.
Let me start off by saying I hate wall paper. The woman that lived in the house I now live in must have owned stock in wall paper companies, had a love for wall pape...
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There probably is no way it can be done. Remove wallpaper and start over is the best solution.
You could try using a glue in a needle delivery system, cut a fine hole with an X-acto knife, insert the glue and use a rubber squeege to smooth it out.
https://www.google.com/search?client=opera&q=glue+needle+injector&sourceid=opera&ie=UTF-8&oe=UTF-8
squeegee... http://www.marylandchina.com/rubber-squeegee-2-x-3-5.html?utm_source=google_shopping&gclid=Cj0KCQjw_JrMBRDPARIsACis1HwReyix5WWDgYC87mjYyw3RR_X7cQJf4H1rsoN35W_CZ8WluZVl3sMaAv12EALw_wcB can find where they sell window film like an auto store.
Try using a hair dryer to warm up the wall paper, then prick the wallpaper with a straight pin. Once warm, try using your hands to push and spread.