Perhaps you should try some spelling variations:
thuoc dac » thuoc dang, thuoc sach, thuc dan
tinh hai » tinh thai, tinh chat, trinh han
dang mat » dang vat, dang mau, dung mat
hai cua » thai cua, dai cua, hoi cua
va tinh » may tinh
va cham » va chat, va tham
cua tre » cua te, cuu tre, cua triet
dang ma » dang mau, dang mam, tang ma
dac ky » cac ky, dan ky, sac ky
luc va » duc va, tuc va, loc va
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc dac ky ((dang ma) or (dang mat)) hoi. hieu ((ve cam) or (va cham)) luc va tinh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc dac ky ((dang ma) OR (dang mat)) hoi. hieu ((ve cam) OR (va cham)) luc va tinh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: thuoc dac ky ((dang ma) or (dang mat)) hoi. hieu ((ve cam) or (va cham)) luc va tinh hai cua tre*.