Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
hieu van » hieu va, thien van, lieu va
su sach » so sach
va hanh » van hanh, va thanh, va danh
van bac » van ban, van bao, van hac
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
vu sach » vu bach, vu khach
cua tre » cua te, cuu tre, cua triet

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) OR (vu sach)) ((ty nang) OR (ty hang)) xa hoi. hieu van bac duc va hanh thai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ((ty nang) OR (ty hang)) xa hoi. hieu van bac duc va hanh thai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ((ty nang) OR (ty hang)) xa hoi. hieu van bac duc va hanh thai cua tre*.