Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cua trien he snippets" » "cua triet he snippets", "chua trieu he snippets", "cua truyen he snippets", "cua thien hue snippets", "cua trien ben snippets", "cua trien nha 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: (((("cua trien he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cua trien he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cua trien he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cua trien he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.