Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"phan thi toi snippets" » "pham thi toi snippets", "tran thi toi snippets", "phan tu toi snippets", "phan thi tuoi snippets", "phan thi moi snippets", "phan khi toi 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: (((("phan thi toi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phan thi toi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phan thi toi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phan thi toi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.