To add to user6726's answer:
In general, you can only collect a judgement if there are assets or income available to be collected (i.e., owned by the debtor, and not protected from collection, such as personal items or part of the wages).
If you suspect the debtor has assets you do not know about, you can formally ask the debtor to declare their assets. In Nevada (and in many other US states), this is called an Examination of Judgment Debtor (or just Debtor's examination).
The basic idea is:
- You ask the court to order a debtor's examination.
- The court (after checking your judgement) orders a hearing where the debtor must appear (or they may be imprisoned for contempt of court).
- In the hearing, you can ask the debtor about their assets, and they must answer truthfully (usually under oath).
Details vary, as usual. See for example this page from the Las Vegas Justice Court:
Examination of a Judgment Debtor.
As a practical note:
The whole process, as usual, means additional work and possibly legal cost for the creditor - so it only makes sense if there is a realistic possibility of finding previously unknown assets. As usual, this is a decision the creditor must make.