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

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 nhu) OR (vo nhu)) 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 nhu) OR (vo nhu)) phuong tinh ((toan cao) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - thanh tuong ((va nhu) OR (vo nhu)) phuong tinh ((toan cao) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - thanh tuong ((va nhu) OR (vo nhu)) phuong tinh ((toan cao) or (toan ban))*.