Perhaps you should try some spelling variations:
"co sach tranh nghiep cau hoi" » "co sach trinh nghien cau hoi", "co sach trac nghiem cau hoi", "co sach trinh nghe cau hoi", "co canh tranh nghiep cau hoi", "co sach tranh nghiep cay hoi", "co sach tranh nghiep can hoi", "co sach tranh nghiep chan hoi", "bo sach tranh nghiep cau hoi", "cuon sach tranh nghiep cau hoi", "hoc sach tranh nghiep cau hoi"
"su sach doanh nghiep dai hoc" » "su sach danh nghiep dai hoc", "su cac doanh nghiep dai hoc", "su san doanh nghiep dai hoc", "su sach doanh nghiep tai hoc", "su sach doanh nghiep bai hoc", "su sach doanh nghiep va hoc", "so sach doanh nghiep dai hoc", "vu sach doanh nghiep dai hoc"

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: (("su sach doanh nghiep dai hoc") or ("co sach tranh nghiep cau hoi"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("su sach doanh nghiep dai hoc") OR ("co sach tranh nghiep cau hoi")).
• Removing quotes may allow a broader search: (( su sach doanh nghiep dai hoc ) or ( co sach tranh nghiep cau hoi )).
• Adding a wildcard symbol may retrieve word variants: (("su sach doanh nghiep dai hoc") or ("co sach tranh nghiep cau hoi"))*.