Perhaps you should try some spelling variations:
"dung nga java snippets" » "dung ngan java snippets", "dung nha java snippets", "dung nhan java snippets", "dung ngu java snippets", "dung nga va snippets"
"dung cho con snippets" » "dung cho cong snippets", "dung cho lon snippets", "dung cho can snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core 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: (((("dung nga java snippets") or ("dung cho con snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung nga java snippets") OR ("dung cho con snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung nga java snippets ) or ( dung cho con snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung nga java snippets") or ("dung cho con snippets"))) or ("locating bug code snippets"))*.