Perhaps you should try some spelling variations:
sach tranh » canh tranh
hoc chuyen » khong chuyen
kien thuoc » kien thuc, bien thuoc, trien thuoc
thuoc bach » thuoc sach, thuoc ban, truc bach
tranh hoc » thanh hoc, tranh cuoc, tranh duoc
phan dang » phan dau, phan cong, nhan dan
bach hoa » bach khoa, bach ha, cach hoan
hoa phan » hoa dan, co phan
dang may » mang may, dang xay, dung may
vu sach » vu bach, su sach, vu khach
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 tranh hoc chuyen đe ky thuat: kien thuoc bach hoa phan dang may (tinh or trinh)~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach tranh hoc chuyen đe ky thuat: kien thuoc bach hoa phan dang may (tinh OR trinh).
• Adding a wildcard symbol may retrieve word variants: vu sach tranh hoc chuyen đe ky thuat: kien thuoc bach hoa phan dang may (tinh or trinh)*.