Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"ham hoc sinh snippets" » "am hoc sinh snippets", "tam hoc sinh snippets", "thai hoc sinh snippets", "ham hoc dinh snippets", "ham hoc minh snippets", "ham hoc kinh snippets", "ham hoc sinh 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: (((("ham hoc sinh snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ham hoc sinh snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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