Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
hieu van » hieu va, thien van, lieu va
quoc ban » quoc bao, quoc lan, quoc quan
xuc ban » duc ban, cuc ban, xuat ban
doi cua » dai cua, hoi cua
tu sach » thu sach, su sach, te sach
van cam » van nam, van lam, van cau
mai hoi » mai khoi, dai hoi, lai hoi
cua duc » cua tuc, cua nuoc, cua quoc
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang

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 ((y nang) OR (v nang)) mai hoi. hieu van cam ((xuc ban) OR (quoc ban)) thanh doi cua duc~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) or (v nang)) mai hoi. hieu van cam ((xuc ban) OR (quoc ban)) thanh doi cua duc~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) or (v nang)) mai hoi. hieu van cam ((xuc ban) OR (quoc ban)) thanh doi cua duc*.