Search Google for:
site:.edu assistant professor literature [plus your keywords from the ad]
The site:.edu restricts your Google to educational institutions only, which will help you skip more sites reposting the job ads, term paper mills, etc.
Look through your Google search results to find a scholar who has the same specialization sought in the advertisement. The scholar might be:
- a graduate student who is ABD (all but dissertation)
- a lecturer, instructor, or visiting assistant professor (these are all temporary positions)
- an assistant professor at another institution