Perhaps you should try some spelling variations:
"dung doc trinh snippets" » "dung doc tinh snippets", "dung doi trinh snippets", "dung hoc trinh snippets", "dung coc trinh snippets", "dung doc trinh slippers"
"dung hung code snippets" » "dung chung code snippets", "dung nhung code snippets", "dung huong code snippets", "dung hung code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"dung doc trinh snippets\") OR (\"dung hung code snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( dung doc trinh snippets ) OR ( dung hung code snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("dung doc trinh snippets") OR ("dung hung code snippets"))) OR ("locating bug code snippets"))*.