Perhaps you should try some spelling variations:
"hang java java snippets" » "hang va java snippets"
"dung co chap snippets" » "dung cho chap snippets", "dung cong chap snippets", "dung cua chap snippets", "dung co cham snippets", "dung co champa snippets", "dung cao chat 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 co chap 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 co chap snippets") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung co chap snippets ) or ( hang java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung co chap snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))*.