Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cau tren » cu tren, dau tren, ca tren
thanh vi » hanh vi, thanh va, thanh ve
tay lang » tai lang, tay tang, tay quang
xuc ban » duc ban, cuc ban, quoc ban
tu sach » thu sach, su sach, te sach
ty lang » ty xang, ty hang, tu lang
va dau » va dao
vi cau » ve cau, di cau, viet cau
va cau » van cau, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ty lang) OR (tay lang)) xa hoi. hieu ((va cau) or (va dau)) xuc ban thanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty lang) OR (tay lang)) xa hoi. hieu ((va cau) OR (va dau)) xuc ban thanh vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty lang) OR (tay lang)) xa hoi. hieu ((va cau) or (va dau)) xuc ban thanh vi cau tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty lang) OR (tay lang)) xa hoi. hieu ((va cau) or (va dau)) xuc ban thanh vi cau tren*.