Perhaps you should try some spelling variations:
hoc chuyen » khong chuyen
phan xuong » phan cong
xuong doan » xuong dan, xuong hoan, phuong doan
sach tien » sach tren, sach thieu
thuc bach » thuc cach, thuoc sach, thuc hanh
khoa phan » hoa phan, khoa than, khoa phau
doan tinh » doan hinh, ban tinh, quan tinh
tien hoc » tin hoc, tien hoa, dien hoc
tu sach » thu sach, su sach, te sach

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