Perhaps you should try some spelling variations:
"tang cua sio2 snippets" » "mang cua sio2 snippets", "hang cua sio2 snippets", "tang luan sio2 snippets", "tang cua sinh snippets", "tang cao sio2 snippets", "tang cua so snippets", "tang cua 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: (((("tang cua 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: (((("tang cua sio2 snippets") OR ("python using a snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tang cua sio2 snippets ) or ( python using a snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tang cua sio2 snippets") or ("python using a snippets"))) or ("locating bug code snippets"))*.