Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"trung tam do snippets" » "trung tham do snippets", "trung tam o snippets", "trung nam do snippets", "truong tam do snippets", "trong tam 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: (((("trung tam do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trung tam do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trung tam do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trung tam do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.