Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"doi qua tang snippets" » "doi qua hang snippets", "doi qua mang snippets", "doi qua nang snippets", "doi cua tang snippets", "hoi qua tang snippets", "doi quy tang snippets", "doi qua tang 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: (((("doi qua tang snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doi qua tang snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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