Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cho van don snippets" » "chao van don snippets", "chon van don snippets", "cho vay don snippets", "cho van dong snippets", "cho van doan snippets", "cho van dan 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: (((("cho van don snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cho van don snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cho van don snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cho van don snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.