Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cong dieu so snippets" » "dong dieu so snippets", "cong hieu so snippets", "trong dieu so snippets", "cong lieu so snippets", "cong dieu co 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: (((("cong dieu so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong dieu so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong dieu so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong dieu so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.