Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doi mon toan snippets" » "doi manh toan snippets", "doi minh toan snippets", "doi nin toan snippets", "doi moi toan snippets", "doi mo toan snippets", "loi mon 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: (((("doi mon 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: (((("doi mon toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doi mon toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doi mon toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.