Perhaps you should try some spelling variations:
"lang cao code snippets" » "nang cao code snippets", "lang co code snippets", "quang cao code snippets", "lang cao cong snippets", "lang cao de snippets", "lang cfd code snippets", "lang cao code slippers"
"dung co code snippets" » "dung cho code snippets", "dung cong code snippets", "dung cua code snippets", "dung cfd code snippets", "dung co code slippers"
"locating bug code snippets" » "locating bug code slippers", "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: (((("dung co code snippets") or ("lang cao code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung co code snippets") OR ("lang cao code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung co code snippets ) or ( lang cao code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung co code snippets") or ("lang cao code snippets"))) or ("locating bug code snippets"))*.