Perhaps you should try some spelling variations:
"tien trinh c snippets" » "tien thinh c snippets", "bien tinh c snippets", "tien thanh c snippets", "tien trinh co snippets", "tien trinh _ snippets", "tien trinh cau snippets"
"python using java snippets" » "python using data 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: (((("tien trinh c snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tien trinh c snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tien trinh c snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tien trinh c snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.