Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
luoc van » luoc can, luoc va, luc van
vu sach » vu bach, su sach, vu khach
va tham » van tham, va thanh, va thuat
va cham » va chat
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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: vu sach y ((nang xa) OR (nang ma)) hoi. lieu ((va cham) OR (va tham)) luoc van hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y ((nang xa) or (nang ma)) hoi. lieu ((va cham) OR (va tham)) luoc van hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: vu sach y ((nang xa) or (nang ma)) hoi. lieu ((va cham) OR (va tham)) luoc van hanh vi cua tre*.