Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"van thi yong snippets" » "van thi code snippets", "van thi cong snippets", "van thi hong snippets", "van thi song snippets", "van tai yong snippets", "dan thi yong snippets", "van thu yong snippets"
"python using java snippets" » "python using data 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: (((("van thi yong snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van thi yong snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( van thi yong snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van thi yong snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.