Perhaps you should try some spelling variations:
"using java java snippets" » "using data java snippets"
"van duong cac slippers" » "van dong cac slippers", "van dung cac slippers", "van phong cac slippers", "van luong cac slippers", "van cuong cac slippers", "van duong cac slippery", "van duong cac grippers"
"locating bug code snippets" » "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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"using java java snippets\") OR (\"van duong cac slippers\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( using java java snippets ) OR ( van duong cac slippers ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java java snippets") OR ("van duong cac slippers"))) OR ("locating bug code snippets"))*.