Perhaps you should try some spelling variations:
sach trung » mach trung, sach thuong, sach dung
hoc chuyen » khong chuyen
trung hoc » trung quoc
thuc hang » thuc hanh, thu hang, phuc hang
khoa phan » hoa phan, khoa phau, khoan phai
khoa than » khoa luan, hoa thai, hoa tan
thu sach » tu sach, thuat sach, thuoc sach
cong may » cong xay, cong ma, cong hay
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: thu sach trung hoc chuyen đe ky thuat: kien thuc hang ((khoa phan) OR (khoa than)) cong may tinh~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach trung hoc chuyen đe ky thuat: kien thuc hang ((khoa phan) OR (khoa than)) cong may tinh".
• Adding a wildcard symbol may retrieve word variants: thu sach trung hoc chuyen đe ky thuat: kien thuc hang ((khoa phan) OR (khoa than)) cong may tinh*.