Perhaps you should try some spelling variations:
"dung cac ngan snippets" » "luong cac ngan snippets", "dung cho ngan snippets", "dung tai ngan snippets", "dung cac nganh snippets", "dung cac nhan snippets", "dung sach ngan snippets", "dung cac ngan slippers"
"using _ code snippets" » "using _ 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: (((("using _ code snippets") or ("dung cac ngan snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using _ code snippets") OR ("dung cac ngan snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using _ code snippets ) or ( dung cac ngan snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using _ code snippets") or ("dung cac ngan snippets"))) or ("locating bug code snippets"))*.