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

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