Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doi cua lee snippets" » "hoi cua lee snippets", "dai cua lee snippets", "dong cua lee snippets", "doi cua le snippets", "doi chul lee 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 cua lee 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 cua lee snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doi cua lee snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doi cua lee snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.