Perhaps you should try some spelling variations:
"trinh toan 1 snippets" » "tinh toan 1 snippets", "thanh toan 1 snippets", "trinh han 1 snippets", "trinh toan _ snippets", "trinh toan 4 snippets", "trinh toan o snippets", "trinh toan 1 slippers"
"python using code snippets" » "python using cfd snippets", "python using one snippets", "python using 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 toan 1 snippets") or ("python using code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh toan 1 snippets") OR ("python using code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh toan 1 snippets ) or ( python using code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh toan 1 snippets") or ("python using code snippets"))) or ("locating bug code snippets"))*.