Perhaps you should try some spelling variations:
thien van » thi van
lang van » dang van, tang van, hoang van
cau treo » cau theo, cau tren, cau triet
lang xa » lang ha, dang xay
sach lo » sach dao, sach doi, sach hoi
van hac » van hoc, van ha, van hai
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
so sach » so sanh, bo sach, co sach
hac tu » hoc tu, tac tu, cac tu

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 ((lang xa) OR (lang van)) hoi. thien van hac 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 ((lang xa) OR (lang van)) hoi. thien van hac 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 ((lang xa) OR (lang van)) hoi. thien van hac tu va hanh vi ((cua tre) or (cau treo))".
• Adding a wildcard symbol may retrieve word variants: so sach lo ((lang xa) OR (lang van)) hoi. thien van hac tu va hanh vi ((cua tre) or (cau treo))*.