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