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

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 mai khoi. hieu ((((ve cam) OR (ve cac))) or (va cam)) dua ban thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang mai khoi. hieu ((((ve cam) OR (ve cac))) OR (va 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 khoi. hieu ((((ve cam) OR (ve cac))) or (va cam)) dua ban thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang mai khoi. hieu ((((ve cam) OR (ve cac))) or (va cam)) dua ban thanh vai cua tre*.