Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
thanh trung » thanh tung
phuong dinh » phuong binh, phuong linh, phuong trinh
doi chieu » doi chi, ho chieu, mot chieu
dinh toan » tinh toan, hinh toan, minh toan
doc hieu » toc thieu, hoc thieu, hoc hien
trung va » truong va, trang va, trung ha
toan cau » 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: ((doi chieu) or (doc hieu)) sach - thanh trung va nhung phuong dinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) sach - thanh trung va nhung phuong dinh toan cau.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doc hieu)) sach - thanh trung va nhung phuong dinh toan cau*.