Perhaps you should try some spelling variations:
"dung chat doan snippets" » "dung nhat doan snippets", "luong chat doan snippets", "dung cho doan snippets", "dung chan doan snippets", "dung chuan doan snippets", "dung chat ban snippets"
"hang java java snippets" » "hang va java 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 chat doan 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 chat doan snippets") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung chat doan snippets ) or ( hang java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung chat doan snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))*.