Perhaps you should try some spelling variations:
hoc chuyen » khong chuyen
sach song » sach dung
khoa pham » khoa kham, khoa phau, khoa cham
pham dung » pham dang, pham dong, pham hung
song hoc » dong hoc, song ho, song hong
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
dung may » dung va, dung tai, mang may
su sach » so sach, vu sach

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 song hoc chuyen đe ky thuat: kien thuc anh khoa pham dung may ((minh or trinh) or dinh)~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach song hoc chuyen đe ky thuat: kien thuc anh khoa pham dung may ((minh OR trinh) OR dinh).
• Adding a wildcard symbol may retrieve word variants: su sach song hoc chuyen đe ky thuat: kien thuc anh khoa pham dung may ((minh or trinh) or dinh)*.