Perhaps you should try some spelling variations:
"dung cong da snippets" » "dung trong da snippets", "dung cong dan snippets", "dung cong dac snippets", "dung cong dau snippets"
"trinh da code snippets" » "trinh dan code snippets", "trinh dao code snippets", "trinh do code snippets", "trinh da core snippets"
"locating bug code snippets" » "locating bug core snippets", "locating bung code snippets", "locating bugs code 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: (((("trinh da code snippets") or ("dung cong da snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh da code snippets") OR ("dung cong da snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh da code snippets ) or ( dung cong da snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh da code snippets") or ("dung cong da snippets"))) or ("locating bug code snippets"))*.