Multiple value for the attributes in a selector

I am trying to perform PDF scrapping for various kinds of invoices, and i am facing the problem of scrapping the data. I want to scrap the invoice number from each invoice but it is mentioned with different names like INV # or Invoice Num or Invoice Number, so i am not able to scrape the invoice number, so can anyone please help me this?

Make 3 attempt for scrapping for each name ,Use most common first if it fails then it will try second and so on

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yes but the problem is it has attributes like Invoice date too, which needs to be scrapped out too having same trouble