Perhaps you should try some spelling variations:
kien thuoc » kien thuc, bien thuoc, trien thuoc
hoc chuyen » khong chuyen
thuoc bach » thuoc sach, thuoc ban, truc bach
sach tren » sach tien, sach tranh
tren hoc » truyen hoc, trung hoc, triet hoc
bach hoa » bach khoa, bach ha, cach hoan
hoa phan » hoa dan, co phan
phan dau » phan tu, hang dau
vu sach » vu bach, su sach, vu khach
dau may » dam may, dat may, dau cay
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 tren hoc chuyen đe ky thuat: kien thuoc bach hoa phan dau may (tinh or trinh)~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach tren hoc chuyen đe ky thuat: kien thuoc bach hoa phan dau may (tinh OR trinh).
• Adding a wildcard symbol may retrieve word variants: vu sach tren hoc chuyen đe ky thuat: kien thuoc bach hoa phan dau may (tinh or trinh)*.