Perhaps you should try some spelling variations:
kien thuoc » kien thuc, bien thuoc, trien thuoc
hoc chuyen » khong chuyen
thuoc sach » hoc sach, nuoc sach, thuat sach
sach tien » sach tren, sach thieu
phan dang » phan dau, phan cong, nhan dan
tien hoc » tin hoc, tien hoa, dien hoc
dang may » mang may, dang xay, dung may
vu sach » vu bach, su sach, vu khach
sach do » sach dao, sach doi, sach de
do phan » co phan, d phan, so phan
tinh » dinh, 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: vu sach tien hoc chuyen đe ky thuat: kien thuoc sach do phan dang may (tinh or trinh)~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach tien hoc chuyen đe ky thuat: kien thuoc sach do phan dang may (tinh OR trinh).
• Adding a wildcard symbol may retrieve word variants: vu sach tien hoc chuyen đe ky thuat: kien thuoc sach do phan dang may (tinh or trinh)*.