Perhaps you should try some spelling variations:
"trinh tu code snippets" » "trinh ky code snippets", "trinh do code snippets", "trinh tu code slippers"
"duong ma code snippets" » "duong va code snippets", "cuong ma code snippets", "duong manh code snippets", "duong ma 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: (((("trinh tu code snippets") or ("duong ma code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh tu code snippets") OR ("duong ma code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh tu code snippets ) or ( duong ma code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh tu code snippets") or ("duong ma code snippets"))) or ("locating bug code snippets"))*.