Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
doan vi » doan va, don vi, doan thi
cua tre » cua te, cuu tre, cua triet
cac xuc » cac nuoc, chat xuc, cac cuoc
hieu ve » hieu va, hieu van
van hoi » van hoa, van hoc, van hoe
ky lang » ky nang, ky dang, ky tang
dan vi » don vi, dan va, gan vi

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 lang van hoi. hieu ve ((cac xuc) or (cam xuc)) cam ((dan vi) or (doan vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky lang van hoi. hieu ve ((cac xuc) OR (cam xuc)) cam ((dan vi) OR (doan vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ky lang van hoi. hieu ve ((cac xuc) or (cam xuc)) cam ((dan vi) or (doan vi)) cua tre*.