Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van xuan duc slippers" » "van quan duc slippers", "van tuan duc slippers", "van xuat duc slippers", "van tran duc slippers", "van phan duc slippers", "van xuan huy slippers", "van xuan duc slippery", "van xuan duc grippers"
"locating bug code snippets" » "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: (((("python using java snippets") or ("van xuan duc slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using java snippets") OR ("van xuan duc slippers"))) OR ("locating bug code snippets")).
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