Perhaps you should try some spelling variations:
thanh trung » thanh tung
tinh sach » tinh cach, tinh mach, sinh sach
trung cua » truong cua, trung tuan, trung cap
cong cong » cong dong, trong cong, dung cong
hoc tinh » hoc trinh, hoc sinh, hoc kinh
cong san » cong tac
than cau » toan cau, phan cau, than cap
toan tai » toan tap, doanh tai, toan ban
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc tinh sach - thanh trung cua cong cong san ((than cau) or (((toan tai) or (toan cao))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tinh sach - thanh trung cua cong cong san ((than cau) OR (((toan tai) OR (toan cao)))).
• Adding a wildcard symbol may retrieve word variants: hoc tinh sach - thanh trung cua cong cong san ((than cau) or (((toan tai) or (toan cao))))*.