Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, le thanh
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
va tinh » may tinh
cac luc » cau luc, coc luc, cac nuoc
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
va cua » va chua, via cua, ca 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: vu sach ty ((nang xa) or (nang x)) hoi. hieu ve cac luc ((va thanh) or (va tinh)) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty ((nang xa) OR (nang x)) hoi. hieu ve cac luc ((va thanh) OR (va tinh)) va cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ty ((nang xa) or (nang x)) hoi. hieu ve cac luc ((va thanh) or (va tinh)) va cua tre*.