Perhaps you should try some spelling variations:
hien khanh » hien hanh, dien khanh, thien thanh
hien nhanh » hien hanh, thien thanh, tien thanh
truong cua » truong ca, truong quan, huong cua
truong cao » truong dai
nhung cong » dung cong, thong cong, hang cong
cong sach » ong sach, song sach, duong sach
sach toan » hach toan, sach tranh, hoach toan
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: hoc ((hien khanh) or (hien nhanh)) - thanh ((truong cua) OR (truong cao)) nhung cong sach toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien khanh) OR (hien nhanh)) - thanh ((truong cua) OR (truong cao)) nhung cong sach toan ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien khanh) or (hien nhanh)) - thanh ((truong cua) OR (truong cao)) nhung cong sach toan ban*".