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