Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"thi dan hoc snippets" » "thi dan code snippets", "thi doan hoc snippets", "thi lan hoc snippets", "thi dai hoc snippets", "thi van hoc snippets", "thi dan toc snippets"
"python using data snippets" » "python using java snippets", "python using sat snippets", "python missing data 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 dan hoc snippets") or ("python using data snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("thi dan hoc snippets") OR ("python using data snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( thi dan hoc snippets ) or ( python using data snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thi dan hoc snippets") or ("python using data snippets"))) or ("locating bug core snippets"))*.