Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tan can nghe snippets" » "tan van nghe snippets", "tan cap nghe snippets", "tan cac nghe snippets", "toan can nghe snippets", "ban can nghe 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: (((("tan can nghe snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tan can nghe snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tan can nghe snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tan can nghe snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.