Perhaps you should try some spelling variations:
khai thuong » khac thuong, hai thuong, khai chuong
khau thong » khau thuong, khap thong, khau tong
thuc doanh » thuc hanh, thuc dan, chuc danh
doanh khoa » toan khoa
hang khoa » dung khoa
khoa khau » khoa kham, khoa phau, khoa chau
khoa khai » khoa kham, khoa khac, khoan phai
sach tri » sach tai, sach tren, sach truc
tue hang » te hang, lue zhang, thuy hang
sach tam » sach tham, sach tai, sach dao
tam thuc » tham thuc, am thuc, nam thuc
tu sach » thu sach, su sach, te sach
vu sach » vu bach, su sach, vu khach

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 tri tue hang khoa khau thong ) or ( vu sach tam thuc doanh khoa khai thuong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tri tue hang khoa khau thong ) OR ( vu sach tam thuc doanh khoa khai thuong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tri tue hang khoa khau thong ) or ( vu sach tam thuc doanh khoa khai thuong ))*.