Perhaps you should try some spelling variations:
tinh than » tinh thanh, tinh toan, tinh thai
hieu van » hieu va, thien van, hieu ve
than cua » nhan cua, thai cua, ban cua
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
x hoi » xa hoi, o hoi, x ho

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. ((hieu van) or (lieu va)) bac xuc va tinh than cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. ((hieu van) OR (lieu va)) bac xuc va tinh than cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. ((hieu van) or (lieu va)) bac xuc va tinh than cua tre*.