Perhaps you should try some spelling variations:
phan duong » phan xuong, phan dong, han duong
hoc chuyen » khong chuyen
thuc bach » truc bach, thuc cach, thuoc sach
duong may » duong ma, dung may, duong mat
kinh hoc » sinh hoc, hinh hoc, tinh hoc
bach cau » bac cau, bach mai, sach cap
cau phan » chau phan, cuu phan, cac phan
tu sach » thu sach, su sach, te sach
tinh » trinh, dinh

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 kinh hoc chuyen đe ky thuat: kien thuc bach cau phan duong may (tinh or minh)~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach kinh hoc chuyen đe ky thuat: kien thuc bach cau phan duong may (tinh OR minh).
• Adding a wildcard symbol may retrieve word variants: tu sach kinh hoc chuyen đe ky thuat: kien thuc bach cau phan duong may (tinh or minh)*.