Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van khanh cu snippets" » "van thanh cu snippets", "van hanh cu snippets", "van anh cu snippets", "van khang cu snippets", "van khanh bui snippets", "van khanh 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 khanh cu 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 khanh cu snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van khanh cu snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van khanh cu snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.