Perhaps you should try some spelling variations:
"cuong danh hoc snippets" » "cuon danh hoc snippets", "huong dan hoc snippets", "cuong linh hoc snippets", "cuong dan hoc snippets", "cuong danh hoa snippets", "cuong anh hoc 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: (((("cuong danh hoc snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cuong danh hoc snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cuong danh hoc snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cuong danh hoc snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.