Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ngo cuu toan snippets" » "ngo cuu hoan snippets", "ngo cua toan snippets", "ngo huu toan snippets", "ngoc chu toan 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: (((("ngo cuu toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ngo cuu toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ngo cuu toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ngo cuu toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.