Perhaps you should try some spelling variations:
ban hanh » ban hang
truc ban » thuc ban, truc dan, truc van
su sach » so sach, vu sach
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
sach v » sach va, sach y, sach 2
vi cua » vai cua, di cua
ve cam » ve cac, va cam, ve cai

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: su sach v ((nang x) OR (nang ma)) hoi. hieu ((ve cam) OR (ve cham)) truc ban hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v ((nang x) or (nang ma)) hoi. hieu ((ve cam) OR (ve cham)) truc ban hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach v ((nang x) or (nang ma)) hoi. hieu ((ve cam) OR (ve cham)) truc ban hanh vi cua tre*.