Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"son trinh da snippets" » "son tinh da snippets", "cong trinh da snippets", "dong trinh da snippets", "son trinh dan snippets", "son trinh dao snippets", "son trinh do 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: (((("son trinh da snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("son trinh da snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( son trinh da snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("son trinh da snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.