Perhaps you should try some spelling variations:
"toc tieu trinh snippets" » "toc tien trinh snippets", "toc tien thinh snippets", "toc trieu tinh snippets", "toc thieu trinh snippets", "hoc tieu trinh snippets", "hoc thieu trinh snippets", "toc tieu trinh slippers"
"dung cho code snippets" » "dung cho cong snippets", "dung cfd code snippets", "dung cho con snippets", "dung cho 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: (((("toc tieu trinh snippets") or ("dung cho code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("toc tieu trinh snippets") OR ("dung cho code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( toc tieu trinh snippets ) or ( dung cho code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("toc tieu trinh snippets") or ("dung cho code snippets"))) or ("locating bug code snippets"))*.