Perhaps you should try some spelling variations:
"van hoang sio2 snippets" » "van hoang son snippets", "van hoan sio2 snippets", "quan hoang sio2 snippets", "tran hoang sio2 snippets", "van hoang 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: (((("van hoang 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: (((("van hoang sio2 snippets") OR ("python using a snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("van hoang sio2 snippets") or ("python using a snippets"))) or ("locating bug code snippets"))*.