Perhaps you should try some spelling variations:
quoc chuyen » buoc chuyen, duoc chuyen, thuoc chuyen
sach trung » mach trung, sach thuong, sach dung
kien thuoc » kien thuc, bien thuoc, trien thuoc
thuoc hang » thuoc khang, thuoc dang, thuoc bang
hang khoa » dung khoa
khoa than » khoa luan, hoa thai, hoa tan
than cong » thanh cong, thuan cong, phan cong
te sach » toc sach
ha tinh » may tinh
va tinh » may tinh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach trung quoc chuyen đe ky thuat: kien thuoc hang khoa than cong ((ha tinh) OR (va tinh))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach trung quoc chuyen đe ky thuat: kien thuoc hang khoa than cong ((ha tinh) OR (va tinh))".
• Adding a wildcard symbol may retrieve word variants: te sach trung quoc chuyen đe ky thuat: kien thuoc hang khoa than cong ((ha tinh) OR (va tinh))*.