Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
tang van » dang van, hoang van, trong van
dan thai » dang thai, dan thi, dan than
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
van dat » van dao, van dau, dan dat
lang xa » lang ha, dang xay, lang van
cuu tre » cua tre, cau treo
tu sach » thu sach, su sach, te sach
va dan » ca dan, va dao, va dau
nuoc » quoc, duoc, ngoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((lang xa) or (tang van)) hoi. hieu van dat nuoc va dan thai ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((lang xa) OR (tang van)) hoi. hieu van dat nuoc va dan thai ((cuu tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((lang xa) or (tang van)) hoi. hieu van dat nuoc va dan thai ((cuu tre) or (cau tren))*.