Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"1500 dan hoc snippets" » "1500 tan hoc snippets", "1500 van hoc snippets", "1500 dan toc snippets", "1500 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: (((("1500 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: (((("1500 dan hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( 1500 dan hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("1500 dan hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.