Perhaps you should try some spelling variations:
hoc chuyen » khong chuyen
sach sinh » sach kinh, sach danh, sach song
thuc bach » truc bach, thuc cach, thuoc sach
bach khoa » anh khoa
khoa than » khoa luan, hoa thai, hoa tan
than dung » thanh dung, chan dung, tran dung
dung may » dung va, dung tai, mang may
tu sach » thu sach, su sach, te sach
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: tu sach sinh hoc chuyen đe ky thuat: kien thuc bach khoa than dung may (tinh* OR trinh*)~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach sinh hoc chuyen đe ky thuat: kien thuc bach khoa than dung may (tinh* OR trinh*)".
• Adding a wildcard symbol may retrieve word variants: tu sach sinh hoc chuyen đe ky thuat: kien thuc bach khoa than dung may (tinh* OR trinh*)*.