Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van linh te snippets" » "van minh te snippets", "van dinh te snippets", "van binh te snippets", "van kinh te snippets", "van linh tu snippets", "van linh thi 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 linh te 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 linh te snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van linh te snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van linh te snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.