Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"
"xin ling liu snippets" » "xin xiong liu snippets", "xin liu liu snippets", "xin jin liu snippets", "xin lin liu snippets", "xin ning liu snippets", "xin qing liu snippets"

Try widening your search to All Fields.

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