Perhaps you should try some spelling variations:
thuat mach » thuat sach, thuat tach, thuyet mach
doanh khoa » toan khoa
mach thuc » cach thuc, thach thuc, anh thuc
thuc tiep » thuc tien, truc tiep, thuc hien
tiep bach » vien bach, tien bac, tiep bai
bach khoa » anh khoa
hoc thong » hoc thuong, hoc trong, hoc hong
tue doanh » te doanh, tri doanh, cua doanh
khoa hoc » hoa hoc
thu sach » tu sach, thuat sach, thuoc sach
sach dao » lanh dao
dao tue » dao tuc, dao tuyen, dao tuyet
khoa he » hoa he, khong he, khoa thu

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thuat mach thuc tiep bach khoa hoc thong ) or ( thu sach dao tue doanh khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thuat mach thuc tiep bach khoa hoc thong ) OR ( thu sach dao tue doanh khoa he thong )).
• Adding a wildcard symbol may retrieve word variants: (( thuat mach thuc tiep bach khoa hoc thong ) or ( thu sach dao tue doanh khoa he thong ))*.