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