Perhaps you should try some spelling variations:
than thuong » thanh thuong, phan thuong, han thuong
hoc chuyen » khong chuyen
than thong » toan thong, tran thong, nhan thong
sach dong » sach dung, sach song, sach rong
thuc cach » thuoc sach, truoc cach, thuc hanh
cach khoa » bach khoa, cac khoa, cac khoan
dong hoc » dong co, dong luc
su sach » so sach, vu sach
tinh » trinh, dinh, minh

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 dong hoc chuyen đe ky thuat: kien thuc cach khoa ((than thong) or (than thuong)) may tinh~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach dong hoc chuyen đe ky thuat: kien thuc cach khoa ((than thong) OR (than thuong)) may tinh.
• Adding a wildcard symbol may retrieve word variants: su sach dong hoc chuyen đe ky thuat: kien thuc cach khoa ((than thong) or (than thuong)) may tinh*.