Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
vu khach » vu khanh, vu khac, vay khach
thu sach » tu sach, thuat sach, thuoc sach
cac thuc » cach thuc, cac thu, can thuc
thuc ban » thuoc ban, thuc dan, thu ban
thanh vi » hanh vi, thanh va, thanh ve
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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 lang xa hoi. lieu va cac thuc ban thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (thu sach)) ky lang xa hoi. lieu va cac thuc ban thanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (thu sach)) ky lang xa hoi. lieu va cac thuc ban thanh vi cua tre*.