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