Perhaps you should try some spelling variations:
"dung thang trinh snippets" » "dung thanh trinh snippets", "dung trang trinh snippets", "dung hanh trinh snippets", "hung thang trinh snippets", "cung thang trinh snippets", "dung thuong trinh snippets"
"using 3 code slippers" » "using 3d code slippers", "using a code slippers", "using _ code slippers"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code 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: (((("using 3 code slippers") or ("dung thang trinh snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using 3 code slippers") OR ("dung thang trinh snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using 3 code slippers ) or ( dung thang trinh snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using 3 code slippers") or ("dung thang trinh snippets"))) or ("locating bug code snippets"))*.