Perhaps you should try some spelling variations:
bien thuoc » bien thuc, trien thuoc, kien thuc
hoc chuyen » khong chuyen
thuoc bach » thuoc sach, thuoc ban, truc bach
sach tren » sach tien, sach tranh
phan dang » phan dau, phan cong, nhan dan
tren hoc » truyen hoc, trung hoc, triet hoc
bach hoa » bach khoa, bach ha, cach hoan
hoa phan » hoa dan, co phan
dang may » mang may, dang xay, dung may
su sach » so sach, vu sach
tinh » minh, kinh

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 tren hoc chuyen đe ky thuat: bien thuoc bach hoa phan dang may ((tinh OR trinh) or dinh)~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tren hoc chuyen đe ky thuat: bien thuoc bach hoa phan dang may ((tinh OR trinh) OR dinh).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tren hoc chuyen đe ky thuat: bien thuoc bach hoa phan dang may ((tinh OR trinh) or dinh)".
• Adding a wildcard symbol may retrieve word variants: su sach tren hoc chuyen đe ky thuat: bien thuoc bach hoa phan dang may ((tinh OR trinh) or dinh)*.