Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
duc ban » duc tan, duc van, dua ban
xuc ban » cuc ban, quoc ban, xuat ban
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
ma hoi » xa hoi, ma hoa, me hoi

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 ky nang ((ma hoi) or (mai hoi)). hieu ve cam ((xuc ban) OR (duc ban)) thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ma hoi) OR (mai hoi)). hieu ve cam ((xuc ban) OR (duc ban)) thanh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ma hoi) or (mai hoi)). hieu ve cam ((xuc ban) OR (duc ban)) thanh vai cua tre*".