Perhaps you should try some spelling variations:
"tran doan code snippets" » "trang doan code snippets", "tan doan code snippets", "tran hoan code snippets", "tran doan code slippers"
"dung rung code snippets" » "dung trung code snippets", "duong rung code snippets", "dung ung code snippets", "dung rung 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: (((("tran doan code snippets") or ("dung rung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tran doan code snippets") OR ("dung rung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tran doan code snippets ) or ( dung rung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tran doan code snippets") or ("dung rung code snippets"))) or ("locating bug code snippets"))*.