Just use the Google Engine for that task it shows more results and is fast if you use cached results to preview . Use following string:
- "site:Facebook.com Job offer Vienna" (3000 results) without quote
if you place two quote around "Job offer" the results will be more accurate to your need, or in german
- "site:facebook.com Job Angebot Wien" (500 results)
These simple string force google to search only on the Facebook domain on every Facebook Page Event Group or public Profile post. Same search strings you can use to find a Appartments or nearly anything inside Facebook. Same search on Facebook Post by every one returns plus some Bing results. No results found for your query. Check your spelling or try another term.