Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu doanh » thu oanh, tri doanh, thu hoach
doanh dao » doanh bao, doanh cao, doanh giao
dao thuoc » cao thuoc, tao thuoc, dang thuoc
khoa kham » kho khan, khoa than
hoa thai » hong thai, hoa phan, hoa chat
hoa tan » hoa dan, hoa van, hoa tin

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

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