Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van tru cau snippets" » "van thu cau snippets", "van tu cau snippets", "van tri cau snippets", "van truc cau snippets", "van tru sau snippets", "van tra cau 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 tru cau 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 tru cau snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van tru cau snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van tru cau snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.