Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"luan toan code snippets" » "luan hoan code snippets", "xuan toan code snippets", "luan thanh code snippets", "luan toan co snippets", "luan toan cong snippets", "luan toan de 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: (((("dung java java snippets") OR ("luan toan code snippets"))) OR ("locating bug core snippets"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"dung java java snippets\") OR (\"luan toan code snippets\"))) OR (\"locating bug core snippets\"))".
• Removing quotes may allow a broader search: (((( dung java java snippets ) OR ( luan toan code snippets ))) OR ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") OR ("luan toan code snippets"))) OR ("locating bug core snippets"))*.