Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khac thuong
thuoc bach » thuoc sach, thuoc ban, truc bach
bai thuoc » ban thuoc, bai hoc, cay thuoc
bach khoa » anh khoa
khau tong » khau cong, khau thuong, khac trong
doc sach » hoc sach, toc sach, nuoc sach
sach bai » sach dao, cac bai, sach xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach bai thuoc bach khoa ((khau thong) OR (khau tong))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach bai thuoc bach khoa ((khau thong) OR (khau tong))*".