Perhaps you should try some spelling variations:
van dinh » van minh, van dich, va dinh
te sach » toc sach
ket cua » ket qua, det cua, keo cua
cau luc » cau truc, cau phuc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
tu anh » tu hanh, tu manh, thu anh
tu ang » tu lang, tu anc, tu quang

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((tu ang) or (tu anh)) xa hoi. hieu ve ((cau luc) or (cam xuc)) van dinh ket cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tu ang) OR (tu anh)) xa hoi. hieu ve ((cau luc) OR (cam xuc)) van dinh ket cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ((tu ang) or (tu anh)) xa hoi. hieu ve ((cau luc) or (cam xuc)) van dinh ket cua tre*.