Perhaps you should try some spelling variations:
thien van » thi van
cau treo » cau theo, cau tren, cau triet
so sach » so sanh, bo sach, co sach
sach le » cach le, sach de, sach lo
le lang » le tang, le dang, le xang
lang xa » lang ha, dang xay, lang van
van hoc » van hoa
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren
hoc tu » hoc thuc

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 le lang xa hoi. thien van hoc tu va hanh vi ((((cua tre) or (cuu tre))) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach le lang xa hoi. thien van hoc tu va hanh vi ((((cua tre) OR (cuu tre))) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: so sach le lang xa hoi. thien van hoc tu va hanh vi ((((cua tre) or (cuu tre))) or (cau treo))*.