Perhaps you should try some spelling variations:
"doan cap sio2 snippets" » "doanh cao sio2 snippets", "dan ca sio2 snippets", "toan cao sio2 snippets", "doan cao sio2 snippets", "doan bao sio2 snippets", "doan cap sinh snippets", "doan cap 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: (((("doan cap 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: (((("doan cap sio2 snippets") OR ("python using a snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doan cap sio2 snippets ) or ( python using a snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doan cap sio2 snippets") or ("python using a snippets"))) or ("locating bug code snippets"))*.