Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
cua tre » cua te, cua triet, dua tren
xanh di » danh di, vanh dai, xanh tai
va xanh » va danh, va hanh, va anh
qua cam » qua cham, qua cac, qua ca
cuu tre » cau tren, cau treo
nang o » nang co, nang ho, nang ro
xuc va » duc va, tuc va, luc va
v nang » va nang, vu nang, van nang
o hoi » co hoi, o hoc, o hai

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) or (hoc sach)) v nang o hoi. hieu qua cam xuc va xanh di ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) v nang o hoi. hieu qua cam xuc va xanh di ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sach)) v nang o hoi. hieu qua cam xuc va xanh di ((cua tre) or (cuu tre))*.