Perhaps you should try some spelling variations:
hinh thai » sinh thai, tinh thai, dinh thi
thai cua » than cua, tai cuc, tri cua
tang tai » hang tai, dung tai, sang tao
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
tai hoi » tai khoi, dai hoi, tai hai
hieu va » hieu qua
ky tang » ky nang, ky dang, kho tang
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va

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