Perhaps you should try some spelling variations:
"do cong cong snippets" » "do cong dong snippets", "do trong cong snippets", "do dung cong snippets", "doi cong cong snippets", "do hong cong snippets", "bo cong cong snippets"
"using a java snippets" » "using _ java snippets"
"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 a java snippets\") OR (\"do cong cong snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( using a java snippets ) OR ( do cong cong snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using a java snippets") OR ("do cong cong snippets"))) OR ("locating bug code snippets"))*.