Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
thuoc sach » hoc sach, nuoc sach, thuat sach
sach khoa » sach nha, anh khoa, sinh khoa
khoa khau » khoa kham, khoa phau, khoa chau
thu doanh » thu oanh, tri doanh, thu hoach
doanh thu » doanh tai
bach khoa » anh khoa
tu thuoc » truc thuoc, tu thuong, cua thuoc
tue bach » truc bach, thi bach, vu bach
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
thu tue » thu thue, thu tuc, thu tu
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 tu thuoc sach khoa khau thong ) or ( thu doanh thu tue bach khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tu thuoc sach khoa khau thong ) OR ( thu doanh thu tue bach khoa he thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tu thuoc sach khoa khau thong ) or ( thu doanh thu tue bach khoa he thong ))*.