Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
thanh tuong » thanh thuong, thanh tung, thanh huong
phuong tinh » phuong trinh, phuong binh, khuong tinh
chieu sach » chinh sach, chiet tach, chieu sang
ho chieu » theo chieu, hoc thieu, doi chieu
tuong va » truong va, thuong va, luong va
toan cao » toan tap
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu sach - thanh tuong va nhung phuong tinh ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - thanh tuong va nhung phuong tinh ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - thanh tuong va nhung phuong tinh ((toan cao) or (toan ban))*.