Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, le thanh
su sach » so sach, vu sach
cac duc » cac du, cao duc, cac dac
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
vi cua » vai cua, di cua
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: su sach ky ((nang xa) or (lang xa)) hoi. hieu ve cac duc ((va thanh) or (va tinh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (lang xa)) hoi. hieu ve cac duc ((va thanh) OR (va tinh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (lang xa)) hoi. hieu ve cac duc ((va thanh) or (va tinh)) vi cua tre*.