Perhaps you should try some spelling variations:
"dung dung he snippets" » "duong dung he snippets", "ung dung he snippets", "dung ung he snippets", "dung dung cho snippets"
"dung tinh java snippets" » "dang tinh java snippets", "dung ninh java snippets", "dung tin java snippets", "dung trinh java snippets", "dung think java snippets", "dung tinh va snippets"
"locating bug code snippets" » "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 dung he snippets") or ("dung tinh java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung dung he snippets") OR ("dung tinh java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung dung he snippets ) or ( dung tinh java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung dung he snippets") or ("dung tinh java snippets"))) or ("locating bug code snippets"))*.