Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"doc phan cuu snippets" » "doc phan code snippets", "hoc phan cuu snippets", "duc phan cuu snippets", "doc than cuu snippets", "doc phan cau snippets", "doc phan huu snippets", "doc phan cung snippets"
"python using java snippets" » "python using data snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("doc phan cuu snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doc phan cuu snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
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