Perhaps you should try some spelling variations:
"hang java java snippets" » "hang va java snippets"
"dung pham chi snippets" » "dung phan chi snippets", "hung pham chi snippets", "tung pham chi snippets", "dung pham thi snippets", "dung tham chi snippets", "dung pham chieu 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 java java snippets") or ("dung pham chi snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hang java java snippets") OR ("dung pham chi snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hang java java snippets ) or ( dung pham chi snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hang java java snippets") or ("dung pham chi snippets"))) or ("locating bug code snippets"))*.