Perhaps you should try some spelling variations:
sinh thai » dinh thi
nang tai » hang tai, tang tai, sang tai
thai cua » than cua, tai cuc, tri cua
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
tai hoi » tai khoi, dai hoi, tai hai
hieu va » hieu qua
va sinh » va kinh, va tinh, vi sinh
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang tai hoi. ((hieu va) or (lieu va)) cam xuc va sinh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang tai hoi. ((hieu va) OR (lieu va)) cam xuc va sinh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ky nang tai hoi. ((hieu va) or (lieu va)) cam xuc va sinh thai cua tre*.