Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
cuu tre » cua tre, cau tren
va hanh » van hanh, va thanh, va danh
so sach » so sanh, bo sach, co sach
sang ma » tang ma, nang ma, sang tao
le dat » de dat, le dac, ve dat
y sang » _ sang, duy sang
le dan » ke dan
ma hoi » mai hoi, xa hoi, ma hoa

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 y sang ma hoi. hieu ((le dat) or (le dan)) nuoc va hanh vi ((cuu tre) OR (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y sang ma hoi. hieu ((le dat) OR (le dan)) nuoc va hanh vi ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y sang ma hoi. hieu ((le dat) or (le dan)) nuoc va hanh vi ((cuu tre) OR (cau treo))".
• Adding a wildcard symbol may retrieve word variants: so sach y sang ma hoi. hieu ((le dat) or (le dan)) nuoc va hanh vi ((cuu tre) OR (cau treo))*.