Perhaps you should try some spelling variations:
"phan thiet o snippets" » "phap thiet o snippets", "chuan thiet o snippets", "luan thiet o snippets", "phan thieu o snippets", "phan thiet ke snippets", "phan thieu so snippets"
"python using java snippets" » "python using data 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: (((("phan thiet o snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phan thiet o snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phan thiet o snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phan thiet o snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.