For the lower-income people in HK communities who are facing severe unemployment problems during the epidemic, it seems impossible to conduct a random sampling for a simple survey on community support for disadvantaged groups during Covid-19. Could you please give me some advice?

No worries.

I see. Thanks for your reply!

If it’s difficult to draw a random probability sampling, you may try non-probability samplings, such as convenience sampling and snowball sampling. But you should be cautious to make an inference about the population based on results obtained from your sample. Maybe you can put it into a limitation of the evaluation results.