Perhaps you should try some spelling variations:
phan thuong » hang thuong, phan xuong
thuoc doanh » thuoc dang, thuoc dong, thuoc thanh
doanh khoa » toan khoa
cach khoan » cac khoan, cach hoan, bach khoa
khoan phan » khoan phai, khoan thanh, hoa phan
ban thuoc » dang thuoc, cay thuoc, nam thuoc
phu thong » pho thong, phap thong, khau thong
thuc cach » thuoc sach, truoc cach, thuc hanh
sach ban » sach han, sach bac, sach bao
khoa phu » khoa phau, khoa thu, hoa phu
sach bai » sach dao, cac bai, sach xa
bai thuc » bai thuoc, bao thuc, dai thuc
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 ban thuoc doanh khoa phu thong ) or ( tu sach bai thuc cach khoan phan thuong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach ban thuoc doanh khoa phu thong ) OR ( tu sach bai thuc cach khoan phan thuong ))*.