Perhaps you should try some spelling variations:
"hanh nghe code snippets" » "hanh nghe che snippets", "hanh nghe co snippets", "hanh nghe cong snippets", "anh nghe code snippets", "van nghe code snippets", "lang nghe code snippets", "hanh nghe code slippers"
"using a code snippets" » "using a 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 a code snippets") or ("hanh nghe code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using a code snippets") OR ("hanh nghe code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using a code snippets ) or ( hanh nghe code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using a code snippets") or ("hanh nghe code snippets"))) or ("locating bug code snippets"))*.