Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
dang xay » dang van, van xay
va thanh » gia thanh, ban thanh, va tinh
chat xuc » chat huu, cam xuc, chat cua
bo sach » co sach, hoc sach
sach ky » sac ky, sach y, sach ty
vai cua » dai cua, hai cua, lai cua
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ky ((dang xay) or (nang x)) hoi. hieu va ((chat xuc) OR (chao xu)) va thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ky ((dang xay) OR (nang x)) hoi. hieu va ((chat xuc) OR (chao xu)) va thanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ky ((dang xay) or (nang x)) hoi. hieu va ((chat xuc) OR (chao xu)) va thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: bo sach ky ((dang xay) or (nang x)) hoi. hieu va ((chat xuc) OR (chao xu)) va thanh vai cua tre*.