#1 --  You can go to ‘Legend Shapes’ under ‘Shapes’ and add some similar symbols.

#2 -- You can go to 'SEARCH' under 'Shapes' and search for symbols by keywords - person, key, home, face, bubble, file, question, etc.

#3 -- You can try to find some symbols online by going to ‘Insert’ tab > ‘Online Pictures.’ -- You can try keywords such as person, key, home, face, bubble, file, question, etc. in the Bing Image Search.

You may not be able to find the exact same symbols, but it is okay to find and add some similar symbols. 

I believe that you have find appropriate symbols with #1 and #2 above. 

#3 is not highly recommended due to the file size, but it is good to know this option.