Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
doan van » doan va, hoang van, luan van
tang van » dang van, hoang van, trong van
lam duoc » nam duoc, luat duoc, lam thuoc
duoc tap » duoc thao, hoc tap, tuc tap
tap doan » tap quan
lang xa » lang ha, dang xay, lang van
cua tre » cuu tre, cua triet, dua tren
sach ky » sac ky, sach y, sach ty
va lam » van lam, va lap
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky ((lang xa) or (tang van)) hoi. lieu va lam duoc tap doan van ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((lang xa) OR (tang van)) hoi. lieu va lam duoc tap doan van ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((lang xa) or (tang van)) hoi. lieu va lam duoc tap doan van ((cua tre) or (cua te))*.