Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nho tac so snippets" » "nho tai so snippets", "tho tac so snippets", "nhom tay so snippets", "nho tac co snippets", "nho tac su 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: (((("nho tac 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: (((("nho tac so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nho tac so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nho tac so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.