Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dun nang chon snippets" » "dun nang cho snippets", "dun nang cao snippets", "dun nang hoc snippets", "dung nang chon snippets", "den nang chon snippets", "luan nang chon 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 java java snippets") or ("dun nang chon snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("dun nang chon snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( dun nang chon snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("dun nang chon snippets"))) or ("locating bug code snippets"))*.