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