Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thu viec doc snippets" » "thu vien doc snippets", "thuc viet doc snippets", "thue viet doc snippets", "thu viec quoc snippets", "thu viec so snippets", "thu viec dat 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: (((("thu viec doc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("thu viec doc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thu viec doc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thu viec doc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.