Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"thu phan gao snippets" » "thu nhan gao snippets", "thuat phan gao snippets", "than phan gao snippets", "thu han gao snippets", "thu phan bao snippets", "thu zhan gao snippets", "thu phan gao 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: (((("thu phan gao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("thu phan gao snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thu phan gao snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
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