Perhaps you should try some spelling variations:
"dung lai toan snippets" » "dung lai code snippets", "dung tai toan snippets", "dung lam toan snippets", "dung sai toan snippets", "dung bai toan snippets", "dung lap toan snippets", "dung lai thanh snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung java java snippets" » "dung va java snippets"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung lai toan snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung lai toan snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung lai toan snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung lai toan snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.