Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"hang mang cua snippets" » "hang hang cua snippets", "hang mong cua snippets", "hanh mang cua snippets", "hang manh cua snippets", "hang dung cua snippets", "hang ban cua 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 java java snippets") or ("hang mang cua snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("hang mang cua snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( hang mang cua snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("hang mang cua snippets"))) or ("locating bug code snippets"))*.