Perhaps you should try some spelling variations:
thuong dong » phuong dong, tuong dong, chuong dong
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
hanh trung » thanh trung, hanh trang, danh trung
manh trung » manh tung, thanh trung, manh hung
cao thuong » cao truong, ca thuong, cho thuong
dong tac » cong tac, dong tai, dong bac
tac than » tac thanh, tam than, tac nhan
than tap » toan tap, han tap, phan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu sach - ((hanh trung) or (manh trung)) cao thuong dong tac than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - ((hanh trung) OR (manh trung)) cao thuong dong tac than tap.
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - ((hanh trung) or (manh trung)) cao thuong dong tac than tap*.