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
phan cung » phan cong, phan ung, phan xuong
cung may » dung may, cong may, cung hay
tu sach » thu sach, su sach, te sach
bach co » bach cau, bach hoa, bach mao
tinh » 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 co phan cung may ((tinh OR trinh) or dinh)~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach sinh hoc chuyen đe ky thuat: kien thuc bach co phan cung may ((tinh OR trinh) OR dinh).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach sinh hoc chuyen đe ky thuat: kien thuc bach co phan cung may ((tinh OR trinh) or dinh)".
• Adding a wildcard symbol may retrieve word variants: tu sach sinh hoc chuyen đe ky thuat: kien thuc bach co phan cung may ((tinh OR trinh) or dinh)*.