Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
dang xay » dang van, van xay
vu sach » vu bach, su sach, vu khach
cam duc » cam xuc, cao duc, pham duc
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
nang xa » nang x, lang xa, nang ma
vi cua » vai cua, di cua
ve cam » ve cham, ve cac, va cam

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

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