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