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