Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
thuoc sach » hoc sach, nuoc sach, thuat sach
doanh thuc » doanh thu, danh thuc, doan thuc
cua thuoc » nha thuoc, cay thuoc, cua nuoc
sach khoa » sach nha, anh khoa, sinh khoa
khoa khau » khoa kham, khoa phau, khoa chau
thu doanh » thu oanh, tri doanh, thu hoach
thuc thuc » hoc thuc
thuc bach » truc bach, thuc cach, thuc hanh
bach khoa » anh khoa
sach cua » mach cua, cach cua, sac cua
tu sach » thu sach, su sach, te sach
khoa he » hoa he, khoa hoc, khong he

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 cua thuoc sach khoa khau thong ) or ( thu doanh thuc thuc bach khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach cua thuoc sach khoa khau thong ) OR ( thu doanh thuc thuc bach khoa he thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach cua thuoc sach khoa khau thong ) or ( thu doanh thuc thuc bach khoa he thong ))*.