Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
thien van » thi van
thi cong » tai cong, thien cong
vai cua » dai cua, hai cua, lai cua
dua ban » dia ban, cua ban, qua ban
cam dua » ca dua, cay dua, chay dua
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach kem
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach tu, sach thu

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) OR (sach ty)) nang ma hoa. ((thien van) OR (thi cong)) cam dua ban thanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach ty)) nang ma hoa. ((thien van) or (thi cong)) cam dua ban thanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach ty)) nang ma hoa. ((thien van) or (thi cong)) cam dua ban thanh vai cua tre*.