Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
sach doanh » sach danh, sach tranh, cac doanh
hanh trinh » canh tranh, hanh chinh
thiet luan » thien luan, thi luan, thien quan
minh hoc » sinh hoc, hinh hoc, tinh hoc
luan hoc » luan hoan, quang hoc, luan khoa
tu sach » thu sach, su sach, te sach

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach doanh nghiep minh hoc ) or ( thuc hanh trinh thiet luan hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach doanh nghiep minh hoc ) OR ( thuc hanh trinh thiet luan hoc )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach doanh nghiep minh hoc ) or ( thuc hanh trinh thiet luan hoc ))*.