Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"moi dan hoc snippets" » "moi dang hoc snippets", "hoi dan hoc snippets", "doi dan hoc snippets", "moi van hoc snippets", "moi dan toc snippets", "moi dai hoc 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: (((("moi dan hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("moi dan hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( moi dan hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("moi dan hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.