Perhaps you should try some spelling variations:
"tran hong phan snippets" » "tran hoang phan snippets", "tran hung phan snippets", "tran trong phan snippets", "tran thong phan snippets", "tran huong phan snippets", "tran cong phan snippets", "tran hong phan slippers"
"dung java java snippets" » "dung va java snippets", "dung java java 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: (((("tran hong phan snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tran hong phan snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tran hong phan snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tran hong phan snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.