Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van tuan cuu snippets" » "van quan cuu snippets", "van ban cuu snippets", "anh tuan cuu snippets", "van tuan cu snippets", "van quan cua snippets", "van tuan thu 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 tuan cuu 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 tuan cuu snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van tuan cuu snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van tuan cuu snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.