Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang xa » nang x, lang xa, nang ma
qua cam » qua cham, qua cac, qua ca
xanh di » danh di, vanh dai, xanh tai
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va
loc va » hoc va
di cuu » di cau, di cua, dinh cuu

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