Perhaps you should try some spelling variations:
thuoc sac » thuoc sach, thuoc dac, thuoc sai
dau tren » dau tien, dat tren, dau tieng
ky danh » ky anh, ky dang
tac hai » tuc hai, tac ha, ta hai
tai hai » thi hai, dai hai, tai ha
cao luc » bao luc, cao duc, cao suc
va hanh » van hanh, va thanh, va danh
sac ky » cac ky, sai ky
va cao » va cac, va co, va dao
luc va » duc va, tuc va, loc va
vi dau » vi dai, va dau, bi dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sac ky danh ((tac hai) or (tai hai)). lieu va cao luc va hanh vi dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sac ky danh ((tac hai) OR (tai hai)). lieu va cao luc va hanh vi dau tren.
• Adding a wildcard symbol may retrieve word variants: thuoc sac ky danh ((tac hai) or (tai hai)). lieu va cao luc va hanh vi dau tren*.