Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dua tren » dung tren
lang xa » lang ha, dang xay, lang van
qua cao » qua cac, qua ca, qua cai
cao duc » dao duc, cao suc, giao duc
va xanh » va danh, va hanh, va anh
xanh di » danh di, vanh dai, xanh tai
cua tre » cuu tre, cua triet, cua thep
sach v » sach va, sach y, sach 2
v lang » va lang, o lang, _ lang
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 v lang xa hoi. hieu qua cao duc va xanh di ((((cua tre) or (dua tren))) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach v lang xa hoi. hieu qua cao duc va xanh di ((((cua tre) OR (dua tren))) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: toc sach v lang xa hoi. hieu qua cao duc va xanh di ((((cua tre) or (dua tren))) or (cua te))*.