Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh va » thanh van, hanh va, thanh ha
truc ban » thuc ban, truc dan, truc van
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
van cau » van dau, van hau, van chat
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
thu san » thuy san, thu ban, phu san
va cua » va chua, via cua, ca cua
tu san » tu ban, tu can, vu san

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: ((tu san) OR (thu san)) ((ky lang) OR (ky tang)) xa hoi. hieu van cau truc ban thanh va cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu san) or (thu san)) ((ky lang) OR (ky tang)) xa hoi. hieu van cau truc ban thanh va cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((tu san) or (thu san)) ((ky lang) OR (ky tang)) xa hoi. hieu van cau truc ban thanh va cua tre*.