Perhaps you should try some spelling variations:
"tan cong code snippets" » "tan cong cong snippets", "tan cong co snippets", "tan cong che snippets", "tan cuong code snippets", "tran cong code snippets", "toan cong code snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug core snippets" » "locating bug code snippets"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("tan cong code snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"tan cong code snippets\") OR (\"dung java java snippets\"))) OR (\"locating bug core snippets\"))*".
• Removing quotes may allow a broader search: (((( tan cong code snippets ) OR ( dung java java snippets ))) OR ( locating bug core snippets ))*.