Perhaps you should try some spelling variations:
"hang java java snippets" » "hang va java snippets"
"dung ha chen snippets" » "dung va chen snippets", "dung he chen snippets", "dung khoa chen snippets", "dung xay chen snippets", "dung yan chen snippets", "dung ho cheng 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 ha 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 ha chen snippets") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung ha chen snippets ) or ( hang java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung ha chen snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))*.