Perhaps you should try some spelling variations:
"dung quan doc snippets" » "dung quang doc snippets", "dung luan doc snippets", "luong quan doc snippets", "dung quan doi snippets", "dung quan dac snippets", "dung quan doan snippets"
"hang java java snippets" » "hang va java 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 quan doc snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung quan doc snippets") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung quan doc snippets ) or ( hang java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung quan doc snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))*.