Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"don khoi can snippets" » "hon khoi can snippets", "dang khoi can snippets", "dong khoa can snippets", "don khoa can snippets", "don khoi nang snippets", "don hoc can 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: (((("don khoi can snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("don khoi can snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( don khoi can snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("don khoi can snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.