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