Perhaps you should try some spelling variations:
thuoc dang » thuoc khang, thuc dan, thuoc ban
thuoc sach » hoc sach, nuoc sach, thuat sach
thuoc dung » hoc dung, thuy dung
khau thong » khau thuong, khap thong, khau tong
khoa khau » khoa kham, khoa phau, khoa chau
toc sach » hoc sach, nuoc sach, toc san
doc sach » hoc sach, nuoc sach, dac sac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) OR (doc sach)) bai ((thuoc sach) or (((thuoc dang) or (thuoc dung)))) khoa khau thong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) bai ((thuoc sach) OR (((thuoc dang) OR (thuoc dung)))) khoa khau thong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) bai ((thuoc sach) or (((thuoc dang) or (thuoc dung)))) khoa khau thong".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (doc sach)) bai ((thuoc sach) or (((thuoc dang) or (thuoc dung)))) khoa khau thong*.