Perhaps you should try some spelling variations:
ban hanh » ban hang
luoc ban » luoc can, quoc ban, buoc ban
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
va tham » van tham, va cham, va thuat
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.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((nang xa) or (nang ma)) hoi. lieu ((va tham) OR (va thanh)) luoc ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (nang ma)) hoi. lieu ((va tham) OR (va thanh)) luoc ban hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang xa) or (nang ma)) hoi. lieu ((va tham) OR (va thanh)) luoc ban hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) or (nang ma)) hoi. lieu ((va tham) OR (va thanh)) luoc ban hanh vi cua tre*.