Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
so sach » so sanh, bo sach, co sach
sach lo » sach dao, sach doi, sach hoi
lo nang » ho nang, ly nang, loai nang
nang xa » nang x, lang xa, nang ma
van hac » van hoc, van ha, van chat
van hai » van ha, van chat, van hanh
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet

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 lo nang xa hoi. thien ((van hac) OR (van hai)) tu va hanh vi ((cua tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach lo nang xa hoi. thien ((van hac) OR (van hai)) tu va hanh vi ((cua tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach lo nang xa hoi. thien ((van hac) OR (van hai)) tu va hanh vi ((cua tre) or (cau treo))".
• Adding a wildcard symbol may retrieve word variants: so sach lo nang xa hoi. thien ((van hac) OR (van hai)) tu va hanh vi ((cua tre) or (cau treo))*.