Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van anh do snippets" » "van thanh do snippets", "van minh do snippets", "tuan anh do snippets", "van anh doc snippets", "van anh d snippets", "van anh co 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 anh do 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 anh do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van anh do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van anh do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.