Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duy khanh o2 snippets" » "vu khanh o2 snippets", "duy khanh hoa snippets", "duy khanh son snippets", "duy khanh v snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("duy khanh o2 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duy khanh o2 snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duy khanh o2 snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duy khanh o2 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.