Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"
"phan duc tan snippets" » "pham duc tan snippets", "phan tu tan snippets", "phan dau tan snippets", "phan duc tran snippets", "phan duc toan snippets", "phan duc than snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

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