Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"
"dung so trac snippets" » "dung co trac snippets", "dung mo trac snippets", "dung cho trac snippets", "dung so tac snippets", "dung hoi trac snippets", "dung bo trach snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung so trac snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
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