Perhaps you should try some spelling variations:
hoc chuyen » khong chuyen
thuc bach » truc bach, thuc cach, thuoc sach
phan cung » phan cong, phan ung, phan xuong
dien hoc » dien hoa, khien hoc, tin hoc
bach hoa » bach khoa, bach ha, cach hoan
hoa phan » hoa dan, co phan
cung may » dung may, cong may, cung hay
tu mach » tu cach, tu manh, tu hach
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 mach dien hoc chuyen đe ky thuat: kien thuc bach hoa phan cung may ((tinh OR dinh) or trinh)~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach dien hoc chuyen đe ky thuat: kien thuc bach hoa phan cung may ((tinh OR dinh) OR trinh).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu mach dien hoc chuyen đe ky thuat: kien thuc bach hoa phan cung may ((tinh OR dinh) or trinh)".
• Adding a wildcard symbol may retrieve word variants: tu mach dien hoc chuyen đe ky thuat: kien thuc bach hoa phan cung may ((tinh OR dinh) or trinh)*.