Perhaps you should try some spelling variations:
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, ban hanh
ca tren » cau tren, cu tren, la tren
y nang » ky nang, ly nang, v nang
ve ban » te ban, va ban, ve bao
ban bo » can bo, ban do, ban co
x hoi » xa hoi, o hoi, x ho
bo va » bao va, do va, so va
vi ca » vit ca, li ca, va ca

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 x hoi. hieu ve ban bo va hanh vi ca tren~.
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. hieu ve ban bo va hanh vi ca tren*.