Perhaps you should try some spelling variations:
"hao cao sio2 snippets" » "hao bao sio2 snippets", "hao cao son snippets", "hao cao so snippets", "bao cao sio2 snippets", "tao cao sio2 snippets", "dao cao sio2 snippets", "hao cao sio2 slippers"
"python using a snippets" » "python using a slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("hao cao sio2 snippets") or ("python using a snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hao cao sio2 snippets") OR ("python using a snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hao cao sio2 snippets ) or ( python using a snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hao cao sio2 snippets") or ("python using a snippets"))) or ("locating bug code snippets"))*.