Perhaps you should try some spelling variations:
thuoc sac » thuoc sach, thuoc dac, thuoc sai
dang mam » dang nam, dang mau, dang mat
ban hang » ngan hang
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
ve cham » va cham, ve chat, vu cham
mam hoi » mam hoai, nam hoi, mai hoi
ky dang » ky nang, ky danh
sac ky » cac ky, sai ky
ve cam » ve cac, va cam, ve cai

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 dang mam hoi. hieu ((ve cam) or (ve cham)) xuc ((ban hanh) OR (ban hang)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sac ky dang mam hoi. hieu ((ve cam) OR (ve cham)) xuc ((ban hanh) OR (ban hang)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sac ky dang mam hoi. hieu ((ve cam) or (ve cham)) xuc ((ban hanh) OR (ban hang)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sac ky dang mam hoi. hieu ((ve cam) or (ve cham)) xuc ((ban hanh) OR (ban hang)) vai cua tre*.