Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
thuoc ban » thuoc tan, thuoc dang, thu ban
nha thuoc » nha nuoc, nhan thuc, nha hoc
vu khach » vu khanh, vu khac, vay khach
thu sach » tu sach, thuat sach, thuoc sach
vai cua » dai cua, hai cua, lai cua
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
cua tre » cua te, cuu tre, cua triet
va nha » va nho, ve nha

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu khach) or (thu sach)) ((ky tang) OR (ky dang)) xa hoi. lieu va nha thuoc ban thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (thu sach)) ((ky tang) OR (ky dang)) xa hoi. lieu va nha thuoc ban thanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu khach) or (thu sach)) ((ky tang) OR (ky dang)) xa hoi. lieu va nha thuoc ban thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (thu sach)) ((ky tang) OR (ky dang)) xa hoi. lieu va nha thuoc ban thanh vai cua tre*.