Perhaps you should try some spelling variations:
"cong thanh code slippers" » "dong thanh code slippers", "cong trinh code slippers", "cong tan code slippers", "cong thanh cong slippers", "cong thanh de slippers"
"using 3d code snippets" » "using 3 code snippets", "using a code snippets", "using _ code snippets", "using cfd code snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using 3d code snippets") OR ("cong thanh code slippers"))) OR ("locating bug code snippets"))~.
• Removing quotes may allow a broader search: (((( using 3d code snippets ) or ( cong thanh code slippers ))) or ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using 3d code snippets") or ("cong thanh code slippers"))) or ("locating bug code snippets"))*.