Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"toc noi tiep snippets" » "toc noi tiet snippets", "toc noi tieng snippets", "toc hoa tiep snippets", "hoc noi tiep snippets", "toc nguoi tiep snippets", "toeic noi tiep snippets", "toc noi tiep 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.

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