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