Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
truc ban » thuc ban, truc dan, truc van
hieu van » hieu va, thien van, lieu va
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
van cau » van dau, van hau, van chat
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
thu san » thuy san, thu ban, phu san
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 xa hoi. hieu van cau truc ban thanh vi ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu san) or (thu san)) ky lang xa hoi. hieu van cau truc ban thanh vi ((cua tre) OR (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: ((tu san) or (thu san)) ky lang xa hoi. hieu van cau truc ban thanh vi ((cua tre) OR (cuu tre))*.