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