Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thi luan doc snippets" » "thi lan doc snippets", "thi xuan doc snippets", "thi loan doc snippets", "thi luan dac snippets", "thi luan hoc snippets", "thi luan doi 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: (((("thi luan doc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("thi luan doc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thi luan doc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thi luan doc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.