Perhaps you should try some spelling variations:
phan duong » phan xuong, phan dong, han duong
hoc chuyen » khong chuyen
duong may » duong ma, dung may, duong mat
kinh hoc » sinh hoc, hinh hoc, tinh hoc
tu sach » thu sach, su sach, te sach
bach ha » bich ha, sach ha, bach khoa
tinh » trinh, dinh, minh

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 ha) OR (bac ha)) phan duong may tinh~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach kinh hoc chuyen đe ky thuat: kien thuc ((bach ha) OR (bac ha)) phan duong may tinh".
• Adding a wildcard symbol may retrieve word variants: tu sach kinh hoc chuyen đe ky thuat: kien thuc ((bach ha) OR (bac ha)) phan duong may tinh*.