Perhaps you should try some spelling variations:
thuoc tan » thuoc tai, thuoc ban, thuoc tren
nam thuoc » nam thuc, nam thu, nha thuoc
hieu van » hieu va, thien van, lieu va
tu cach » tu cac
tan anh » tuan anh, tran anh, toan anh
ky danh » ky anh
ky dang » ky nang
vu sach » vu bach, su sach, vu khach
cua tre » cua te, cuu tre, cua triet
anh va » hanh va
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (vu sach)) ((ky dang) or (ky danh)) xa hoi. hieu van nam thuoc tan anh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (vu sach)) ((ky dang) OR (ky danh)) xa hoi. hieu van nam thuoc tan anh va cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (vu sach)) ((ky dang) or (ky danh)) xa hoi. hieu van nam thuoc tan anh va cua tre*.