Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
thai cua » than cua, tai cuc, tri cua
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
x hoi » o hoi, x ho, 5 hoi

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 ky nang ((x hoi) OR (xa hoi)). ((hieu van) or (thien van)) bac xuc va hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((x hoi) OR (xa hoi)). ((hieu van) OR (thien van)) bac xuc va hanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((x hoi) OR (xa hoi)). ((hieu van) or (thien van)) bac xuc va hanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((x hoi) OR (xa hoi)). ((hieu van) or (thien van)) bac xuc va hanh thai cua tre*.