Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh va » thanh van, hanh va, thanh ha
vu sach » vu bach, su sach, vu khach
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
van cam » van lam, van cau, van dam
luc ban » duc ban, cuc ban, luc bat
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ky lang) OR (ky tang)) xa hoi. hieu ((van cam) OR (van nam)) luc ban thanh va cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((ky lang) OR (ky tang)) xa hoi. hieu ((van cam) or (van nam)) luc ban thanh va cua tre~".
• Adding a wildcard symbol may retrieve word variants: vu sach ((ky lang) OR (ky tang)) xa hoi. hieu ((van cam) or (van nam)) luc ban thanh va cua tre*.