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