Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"que toi doan snippets" » "que thi doan snippets", "que tri doanh snippets", "que thai doan snippets", "que tai doan snippets", "quen voi doan snippets", "quen tot doan 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: (((("que toi doan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("que toi doan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( que toi doan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("que toi doan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.