Perhaps you should try some spelling variations:
"thu nhat sio2 snippets" » "thu nhat so snippets", "thu nhap sio2 snippets", "thu thuat sio2 snippets", "thu ha sio2 snippets", "thu nhat 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: (((("thu nhat 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: (((("thu nhat sio2 snippets") OR ("python using a snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thu nhat sio2 snippets ) or ( python using a snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thu nhat sio2 snippets") or ("python using a snippets"))) or ("locating bug code snippets"))*.