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 tren » sach tien, sach tranh
sach khoa » bach khoa, sach nha, anh khoa
khoa than » khoa luan, hoa thai, hoa tan
than dung » thanh dung, chan dung, tran dung
thai kinh » thai binh, than kinh, thai tinh
tren hoc » truyen hoc, trung hoc, triet hoc
su sach » so sach, vu sach
ha tinh » va tinh, may tinh

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 sach khoa than dung ((ha tinh) or (thai kinh))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tren hoc chuyen đe ky thuat: kien thuoc sach khoa than dung ((ha tinh) OR (thai kinh)).
• Adding a wildcard symbol may retrieve word variants: su sach tren hoc chuyen đe ky thuat: kien thuoc sach khoa than dung ((ha tinh) or (thai kinh))*.