Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, le thanh
su sach » so sach, vu sach
va tinh » may tinh
sach tu » sach thu, cach tu, sach ty
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
hieu va » lieu va, hieu qua
vi cua » vai cua, di cua
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach tu ((nang xa) or (nang x)) hoi. hieu va cam xuc ((va thanh) or (va tinh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu ((nang xa) OR (nang x)) hoi. hieu va cam xuc ((va thanh) OR (va tinh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach tu ((nang xa) or (nang x)) hoi. hieu va cam xuc ((va thanh) or (va tinh)) vi cua tre*.