Perhaps you should try some spelling variations:
"hoc nhanh sio2 snippets" » "hoc nhanh soc snippets", "hoc nganh sio2 snippets", "hoc phan sio2 snippets"
"python using a slippers" » "python using a slippery", "python using a grippers"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

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

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