Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, truong thanh
hanh trung » thanh trung, hanh trang, manh trung
tieu sach » chieu sach, dien sach, te sach
trung cua » truong cua, trung tuan, trung cap
cua dung » cua dang, cua dong, qua dung
cong tan » cong tac, cong san, cong ty
toan cau » toan cao, toan ban, toan tap

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu sach - hanh trung cua dung ((cong thanh) OR (cong tan)) toan cau~".
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - hanh trung cua dung ((cong thanh) OR (cong tan)) toan cau*.