Perhaps you should try some spelling variations:
sinh thai » dinh thi
thai cua » than cua, tai cuc, tri cua
van sinh » van minh, va sinh, van dinh
chat duc » chat xuc, chat doc, chet duoc
hieu van » thien van, lieu va, hieu ve
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
duc van » duc va, duc tan, duc manh
tu sac » tu sach, tu cac, tu bac
nang o » nang co, nang ho, nang ro
tu san » thu san, tu ban, tu can
o lai » o lao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) or (tu san)) ky nang o lai. ((hieu van) or (hieu va)) chat duc van sinh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu san)) ky nang o lai. ((hieu van) OR (hieu va)) chat duc van sinh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (tu san)) ky nang o lai. ((hieu van) or (hieu va)) chat duc van sinh thai cua tre*.