Perhaps you should try some spelling variations:
"co trach java snippets" » "co trinh java snippets", "bo trach java snippets", "co tranh java snippets", "co tich java snippets"
"python using cfd snippets" » "python using 3d snippets", "python using c snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core 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: (((("python using cfd snippets") or ("co trach java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using cfd snippets") OR ("co trach java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( python using cfd snippets ) or ( co trach java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using cfd snippets") or ("co trach java snippets"))) or ("locating bug code snippets"))*.