Perhaps you should try some spelling variations:
"hang java java snippets" » "hang va java snippets"
"dung dan chen snippets" » "dung dat chen snippets", "dung san chen snippets", "tung dan chen snippets", "dung dan chan snippets", "dung yan chen snippets", "dung can chien 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 dan chen 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 dan chen snippets") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung dan chen snippets ) or ( hang java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung dan chen snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))*.