Perhaps you should try some spelling variations:
hoc chuyen » khong chuyen
sach tren » sach tien, sach tranh
khoa phan » hoa phan, khoa than, khoa phau
tren hoc » truyen hoc, trung hoc, triet hoc
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
dong may » dong ma, dong mau, cong may
dung may » dung va, dung tai, mang may
tu sach » thu sach, su sach, te sach
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 tren hoc chuyen đe ky thuat: kien thuc anh khoa phan ((dong may) OR (dung may)) tinh~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tren hoc chuyen đe ky thuat: kien thuc anh khoa phan ((dong may) OR (dung may)) tinh".
• Adding a wildcard symbol may retrieve word variants: tu sach tren hoc chuyen đe ky thuat: kien thuc anh khoa phan ((dong may) OR (dung may)) tinh*.