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