Perhaps you should try some spelling variations:
"duong dung code snippets" » "cuong dung code snippets", "dung dung code snippets", "duong dang code snippets", "duong dung cong snippets", "duong dung co snippets", "duong dung de snippets", "duong dung code slippers"
"trinh thi code snippets" » "trinh tai code snippets", "trinh thiet code snippets", "trinh tu code snippets", "trinh thi cong snippets", "trinh thi hoe snippets", "trinh thi 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 thi code snippets") or ("duong dung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh thi code snippets") OR ("duong dung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh thi code snippets ) or ( duong dung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh thi code snippets") or ("duong dung code snippets"))) or ("locating bug code snippets"))*.