Perhaps you should try some spelling variations:
dang thuoc » dung thuoc
thuoc sach » hoc sach, nuoc sach, thuat sach
lanh dang » anh dang, lanh bang, lanh sang
khoa than » khoa luan, hoa thai, hoa tan
hoa phan » hoa dan, co phan
khoa thu » hoai thu, ho thu
te lanh » te danh, te lan, tu lanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: te lanh dang thuoc sach ((((hoa phan) or (khoa thu))) or (khoa than)) thong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te lanh dang thuoc sach ((((hoa phan) OR (khoa thu))) OR (khoa than)) thong.
• Adding a wildcard symbol may retrieve word variants: te lanh dang thuoc sach ((((hoa phan) or (khoa thu))) or (khoa than)) thong*.