Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"ngu dung ha snippets" » "ngu cung ha snippets", "nguoi dung ha snippets", "ngoc dung ha snippets", "ngu dung va snippets", "ngu dung he snippets", "ngu dung khoa snippets", "ngu dung ha 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: (((("ngu dung ha snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ngu dung ha snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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