Perhaps you should try some spelling variations:
"dung luat cac snippets" » "dung luan cac snippets", "dung quat cac snippets", "dung cua cac snippets", "dung luat can snippets", "dung luat cau snippets", "dung xuat cac snippets"
"using 3 code snippets" » "using 3d code snippets", "using a code snippets", "using _ code snippets", "using 3 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: (((("using 3 code snippets") or ("dung luat cac snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using 3 code snippets") OR ("dung luat cac snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using 3 code snippets ) or ( dung luat cac snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using 3 code snippets") or ("dung luat cac snippets"))) or ("locating bug code snippets"))*.