Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vai » thanh hai, thanh van, thanh tai
nang mai » nang ma, nang tai, lang mai
hang tai » hang va
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
dua ban » dia ban, cua ban, qua ban
cam dua » ca dua, cay dua, chay dua
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam

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 ky ((nang mai) OR (((hang tai) OR (dung tai)))) hoi. hieu ve cam dua ban thanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang mai) or (((hang tai) OR (dung tai)))) hoi. hieu ve cam dua ban thanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang mai) or (((hang tai) OR (dung tai)))) hoi. hieu ve cam dua ban thanh vai cua tre*.