Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
va thanh » gia thanh, ban thanh, va tinh
so sach » so sanh, bo sach, co sach
cua tre » cua te, cua triet, dua tren
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
cuu tre » cau tren, cau treo
ve cap » ve cac, le cap, ve cai
cuu va » cuu van, cuu ve

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: so sach tu ((nang xa) OR (nang ma)) hoi. hieu ve cap cuu va thanh vai ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach tu ((nang xa) OR (nang ma)) hoi. hieu ve cap cuu va thanh vai ((cua tre) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: so sach tu ((nang xa) OR (nang ma)) hoi. hieu ve cap cuu va thanh vai ((cua tre) or (cuu tre))*.