Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"han man tinh snippets" » "han may tinh snippets", "han ban tinh snippets", "han quan tinh snippets", "than man tinh snippets", "han san tinh snippets", "van man tinh snippets", "han man tinh 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: (((("han man tinh snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("han man tinh snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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