Perhaps you should try some spelling variations:
kien thuoc » kien thuc, bien thuoc, trien thuoc
hoc chuyen » khong chuyen
sach tren » sach tien, sach tranh
thuoc anh » thuoc thanh, thuoc dang, thuoc sach
khoa phan » hoa phan, khoa than, khoa phau
phan dung » phan ung, phan dang, chan dung
tren hoc » truyen hoc, trung hoc, triet hoc
anh khoa » doanh khoa, hang khoa
tai tinh » thai tinh, tai dinh, tri tinh
tai sinh » tai dinh, tai chinh, phai sinh
su sach » so sach, vu sach

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: kien thuoc anh khoa phan dung ((tai tinh) OR (tai sinh))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tren hoc chuyen đe ky thuat: kien thuoc anh khoa phan dung ((tai tinh) OR (tai sinh))".
• Adding a wildcard symbol may retrieve word variants: su sach tren hoc chuyen đe ky thuat: kien thuoc anh khoa phan dung ((tai tinh) OR (tai sinh))*.