Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
nhung cong » dung cong, thong cong, hang cong
tieu sach » chieu sach, dien sach, te sach
trinh cua » tinh cua, trinh luat, trinh luan
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
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 ((trinh cua) OR (trinh quan)) nhung cong tan toan cau~".
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - hanh ((trinh cua) OR (trinh quan)) nhung cong tan toan cau*.