Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"xac xuan duc snippets" » "xac xuat duc snippets", "dac xuan duc snippets", "bach xuan duc snippets", "xac tran duc snippets", "xac phan duc snippets", "xac xuan huy snippets", "xac xuan duc 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: (((("xac xuan duc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("xac xuan duc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( xac xuan duc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
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