Perhaps you should try some spelling variations:
"khoa dan sio2 snippets" » "khoa dang sio2 snippets", "hoa dan sio2 snippets", "khoa can sio2 snippets", "khoa bao sio2 snippets", "khoa cao sio2 snippets", "khoa dan so snippets", "khoa dan 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: (((("khoa dan 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: (((("khoa dan sio2 snippets") OR ("python using a snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoa dan sio2 snippets ) or ( python using a snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoa dan sio2 snippets") or ("python using a snippets"))) or ("locating bug code snippets"))*.