Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"van danh du snippets" » "van danh code snippets", "van doanh du snippets", "van anh du snippets", "van hanh du snippets", "van danh dau snippets", "van danh tu snippets", "van dinh du 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 danh du 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 danh du snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( van danh du snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van danh du snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.