Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"khoe va tham snippets" » "khoe ma tham snippets", "khoi va tham snippets", "khoan va tham snippets", "khoe van tham snippets", "khoe va cham snippets", "khoe va thanh snippets", "khoe va tham 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: (((("khoe va tham snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khoe va tham snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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