Perhaps you should try some spelling variations:
nhung phuong » nhu phuong, truong phuong, bang phuong
dung phuong » dung thuong, bang phuong, dung chung
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
manh toan » thanh toan, anh tuan, tinh toan
tang cua » hang cua, tang luan, thong cua
mang cua » manh cua, dung cua, ban cua
toan cao » toan ban, toan 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 ((tang cua) or (mang cua)) ((nhung phuong) OR (dung phuong)) manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - hanh ((tang cua) OR (mang cua)) ((nhung phuong) OR (dung phuong)) manh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - hanh ((tang cua) or (mang cua)) ((nhung phuong) OR (dung phuong)) manh toan cao".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - hanh ((tang cua) or (mang cua)) ((nhung phuong) OR (dung phuong)) manh toan cao*.