Perhaps you should try some spelling variations:
"dang tinh hoa snippets" » "dang dinh hoa snippets", "dang sinh hoa snippets", "dang vinh hoa snippets", "dang trinh hoa snippets", "dang tinh hoc snippets", "dang minh hoa snippets"
"dung java java snippets" » "dung 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: (((("dang tinh hoa snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dang tinh hoa snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dang tinh hoa snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dang tinh hoa snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.