Perhaps you should try some spelling variations:
va triet » va trien, ve triet, cua triet
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
cap nuoc » dat nuoc
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
xu lang » cu lang, xu dang, xu quang
tu lang » cu lang, tu lanh, tu quang
ve cap » ve cac, le cap, ve cai
x hoi » xa hoi, o hoi, x ho
thiet » thieu

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 sach ((tu lang) OR (xu lang)) x hoi. hieu ve cap nuoc va thanh vi ((va triet) OR (va thiet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tu lang) or (xu lang)) x hoi. hieu ve cap nuoc va thanh vi ((va triet) OR (va thiet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu lang) or (xu lang)) x hoi. hieu ve cap nuoc va thanh vi ((va triet) OR (va thiet))*.