Perhaps you should try some spelling variations:
"viet trong su snippets" » "viet trung su snippets", "viet thong su snippets", "viet huong su snippets", "viet trong san snippets", "viet trong thu snippets", "viet trong qua snippets", "viet trong su slippers"
"using java java snippets" » "using data java snippets", "using java java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core 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: (((("viet trong su snippets") OR ("using java java snippets"))) OR ("locating bug code snippets"))~.
• Removing quotes may allow a broader search: (((( viet trong su snippets ) or ( using java java snippets ))) or ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("viet trong su snippets") or ("using java java snippets"))) or ("locating bug code snippets"))*.