Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cua quoc » cua nuoc, cua thuoc
nang cai » nang cao, nang tai, nang cap
thanh vi » hanh vi, thanh va, thanh ve
cac xuc » cam xuc, cac nuoc, chat xuc
cua duc » cua tuc, cua nuoc
xuc ban » duc ban, cuc ban, quoc ban
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
ve cac » va cac, vien cac

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 cai) OR (nang ma)) hoi. hieu ve cac xuc ban thanh vi ((cua duc) OR (cua quoc))~.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang cai) or (nang ma)) hoi. hieu ve cac xuc ban thanh vi ((cua duc) or (cua quoc))*.