Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doc vien cao snippets" » "hoc vien cao snippets", "doc viet cao snippets", "doc tieng cao snippets", "doc vien cac snippets", "doc vien dai snippets", "doc vien da 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: (((("doc vien cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doc vien cao snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doc vien cao snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doc vien cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.