Perhaps you should try some spelling variations:
sach tranh » canh tranh
hoc chuyen » khong chuyen
kien thuoc » kien thuc, trien thuoc, kien truc
bien thuoc » bien thuc, trien thuoc, kien thuc
tranh hoc » thanh hoc, tranh cuoc, tranh duoc
may trinh » may tinh, lap trinh, quy trinh
nhan tai » hang tai, van tai, toan tai
so sach » so sanh, bo sach, co sach
bach ha » bac ha, bich ha, sach ha
ha nhan » hat nhan, ham nhan, hoa nhan
tai may » tao may, tai my, tai xay

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach tranh hoc chuyen đe ky thuat: ((kien thuoc) or (bien thuoc)) bach ha nhan tai may trinh~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tranh hoc chuyen đe ky thuat: ((kien thuoc) OR (bien thuoc)) bach ha nhan tai may trinh.
• Adding a wildcard symbol may retrieve word variants: so sach tranh hoc chuyen đe ky thuat: ((kien thuoc) or (bien thuoc)) bach ha nhan tai may trinh*.