Perhaps you should try some spelling variations:
"co tranh java snippets" » "co trinh java snippets", "co tranh va snippets", "co thanh java snippets", "co trach java snippets"
"python using pre snippets" » "python nursing pre snippets", "python using one snippets", "python using ph 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 pre snippets") or ("co tranh java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using pre snippets") OR ("co tranh java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( python using pre snippets ) or ( co tranh java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using pre snippets") or ("co tranh java snippets"))) or ("locating bug code snippets"))*.