Perhaps you should try some spelling variations:
thuoc dac » thuoc dang, thuoc sach, thuc dan
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
vai cua » dai cua, hai cua, lai cua
xuc van » duc van, luc van, vuc van
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
mai hoi » mai khoi, dai hoi, lai hoi
ky dang » ky nang, ky danh
dac ky » cac ky, dan ky, sac ky
ma hoi » xa hoi, ma hoa, me hoi
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 dac ky dang ((ma hoi) OR (mai hoi)). hieu ((ve cam) or (ve cham)) xuc van hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc dac ky dang ((ma hoi) OR (mai hoi)). hieu ((ve cam) OR (ve cham)) xuc van hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc dac ky dang ((ma hoi) OR (mai hoi)). hieu ((ve cam) or (ve cham)) xuc van hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc dac ky dang ((ma hoi) OR (mai hoi)). hieu ((ve cam) or (ve cham)) xuc van hanh vai cua tre*.