Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
hieu cao » chieu cao, hieu cac, hieu ca
dang xay » dang van, van xay
vai cua » dai cua, hai cua, lai cua
sach ky » sac ky, sach y, sach ty
bo sach » co sach, hoc sach
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va

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 cao chat ((xuc va) OR (luc 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 cao chat ((xuc va) OR (luc 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 cao chat ((xuc va) OR (luc va)) thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: bo sach ky ((dang xay) or (nang x)) hoi. hieu cao chat ((xuc va) OR (luc va)) thanh vai cua tre*.