Perhaps you should try some spelling variations:
trinh trung » trinh truong, trinh trong, sinh trung
tinh doanh » kinh doanh, minh doanh, chinh doanh
trung cau » trung cap, trung ca, trung can
chu sach » thu sach, chieu sach, chuc hach
cau sach » cao sach, hau sach, rau sach
cua tong » cua cong, cua nong, cua song
cua dong » chua dong, cua cong, cua dang

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chu sach) OR (cau sach)) - tinh doanh ((cua tong) or (cua dong)) cong trinh trung cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chu sach) OR (cau sach)) - tinh doanh ((cua tong) OR (cua dong)) cong trinh trung cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chu sach) OR (cau sach)) - tinh doanh ((cua tong) or (cua dong)) cong trinh trung cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chu sach) OR (cau sach)) - tinh doanh ((cua tong) or (cua dong)) cong trinh trung cau*.