Perhaps you should try some spelling variations:
"dung thi trinh snippets" » "dung tho trinh snippets", "dung thi thanh snippets", "dung thi minh snippets", "dung tai trinh snippets", "dung tri trinh snippets", "dung chi trinh snippets", "dung thi trinh slippers"
"dung cua code snippets" » "dung luan code snippets", "dung cho code snippets", "dung cua cong snippets", "dung cua co snippets", "dung cfd code snippets", "dung cua 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: (((("dung thi trinh snippets") or ("dung cua code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung thi trinh snippets") OR ("dung cua code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung thi trinh snippets ) or ( dung cua code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung thi trinh snippets") or ("dung cua code snippets"))) or ("locating bug code snippets"))*.