Perhaps you should try some spelling variations:
sach khien » sach khuyen, sach thieu, sach tien
hoc chuyen » khong chuyen
khien hoc » nhiet hoc, dien hoc
phan mang » phan dang, phan cang, phan nang
toan hoa » toan khoa, toan hoat, toan ho
toan hoc » toan khoa, van hoc, hoa hoc
su sach » so sach, vu sach
tinh » trinh, dinh, minh

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach khien hoc chuyen đe ky thuat: thien thuat ((toan hoa) OR (toan hoc)) phan mang may tinh~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach khien hoc chuyen đe ky thuat: thien thuat ((toan hoa) OR (toan hoc)) phan mang may tinh".
• Adding a wildcard symbol may retrieve word variants: su sach khien hoc chuyen đe ky thuat: thien thuat ((toan hoa) OR (toan hoc)) phan mang may tinh*.