Perhaps you should try some spelling variations:
"hang java java snippets" » "hang va java snippets"
"dung le chat snippets" » "dung len chat snippets", "dung he chat snippets", "dung de chat snippets", "dung ly chat snippets", "dung le nhat snippets", "dung ve 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 le chat 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 le chat snippets") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung le chat snippets ) or ( hang java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung le chat snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))*.