Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
tham soc » cham soc, tham nuoc, thai son
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren
te sach » toc sach
soc va » hoc va, loc va, doc va

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 ((ky lang) OR (ky dang)) xa hoi. hieu van tham soc va hanh vi ((cuu tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky lang) OR (ky dang)) xa hoi. hieu van tham soc va hanh vi ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky lang) OR (ky dang)) xa hoi. hieu van tham soc va hanh vi ((cuu tre) or (cau treo))".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky lang) OR (ky dang)) xa hoi. hieu van tham soc va hanh vi ((cuu tre) or (cau treo))*.