Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thi tuyen so snippets" » "thi huyen so snippets", "thi xuyen so snippets", "thi tuyet so snippets", "thi quyen so snippets", "thi tuyen o snippets", "thi tuyen 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: (((("thi tuyen 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: (((("thi tuyen so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thi tuyen so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thi tuyen so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.