Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van thi choi snippets" » "van tro choi snippets", "van thi hai snippets", "van thi hoa snippets", "van tai choi snippets", "dan thi choi snippets", "van thu choi 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: (((("van thi choi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van thi choi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van thi choi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van thi choi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.