Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"luan hach so snippets" » "luan mach so snippets", "luan tach so snippets", "luan thanh so snippets", "luan hoach su snippets", "luan hoach do 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: (((("luan hach so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("luan hach so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luan hach so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luan hach so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.