Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
van thanh » ban thanh, van tuan
chua tre » chua tri, cua tre, chua trieu
hieu luc » hieu luat, hieu qua
van chua » va chua, van chia, van chu
hieu tuc » hieu thuc, hieu thuoc, lieu thuc
cham xuc » cam xuc, chat xuc, cham soc
xuc van » duc van, luc van, vuc van
co sach » bo sach, cuon sach, hoc sach
sach ky » sac ky, sach y, sach ty
ky dong » ly dong, ky dang, ky cong
co hoi » co hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach ky dong ((co hoi) OR (co loi)). ((hieu tuc) or (hieu luc)) cham xuc van thanh van chua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ky dong ((co hoi) OR (co loi)). ((hieu tuc) OR (hieu luc)) cham xuc van thanh van chua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ky dong ((co hoi) OR (co loi)). ((hieu tuc) or (hieu luc)) cham xuc van thanh van chua tre".
• Adding a wildcard symbol may retrieve word variants: co sach ky dong ((co hoi) OR (co loi)). ((hieu tuc) or (hieu luc)) cham xuc van thanh van chua tre*.