Perhaps you should try some spelling variations:
"vi trinh code slippers" » "vi trinh cong slippers", "vi trinh co slippers", "vi trinh cad slippers", "vi tinh code slippers", "va trinh code slippers", "viet trinh code slippers"
"using java java snippets" » "using data java 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: (((("vi trinh code slippers") OR ("using java java snippets"))) OR ("locating bug code snippets"))~.
• Removing quotes may allow a broader search: (((( vi trinh code slippers ) or ( using java java snippets ))) or ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("vi trinh code slippers") or ("using java java snippets"))) or ("locating bug code snippets"))*.