Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
phuong tinh » phuong trinh, phuong binh, khuong tinh
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
cua nhung » va nhung
hanh ban » thanh ban, hanh san, hanh han
hang ban » hang luan, hang va, hang tai
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 chieu sach - ((hanh ban) OR (hang ban)) cua nhung phuong tinh toan cau~".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - ((hanh ban) OR (hang ban)) cua nhung phuong tinh toan cau*.