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, hang ban, hanh san
toan cau » toan cao, toan tap, toan tai
toan ban » van ban
ban cua » ban quan

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 cua nhung phuong tinh ((toan cau) OR (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - hanh ban cua nhung phuong tinh ((toan cau) OR (toan ban))*.