Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
quoc ban » quoc bao, quoc lan, quoc quan
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
dai cuu » dai cua, dai huu
xuc ban » duc ban, cuc ban, xuat ban
cuu tre » cua tre, cau tren, cau treo
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
va cam » va cham, va cac, va cao
ve cam » ve cham, ve cac, ve cai
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky tang ma hoi. hieu ((ve cam) or (va cam)) ((xuc ban) OR (quoc ban)) thanh dai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky tang ma hoi. hieu ((ve cam) OR (va cam)) ((xuc ban) OR (quoc ban)) thanh dai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky tang ma hoi. hieu ((ve cam) or (va cam)) ((xuc ban) OR (quoc ban)) thanh dai cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky tang ma hoi. hieu ((ve cam) or (va cam)) ((xuc ban) OR (quoc ban)) thanh dai cuu tre*.