Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cau treo » cau theo, cau tren, cau triet
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cao luc » bao luc, cao duc, cao suc
danh di » danh du, danh dien, danh gia
xanh di » vanh dai, xanh tai
cuu tre » cua tre, cau tren
v nang » va nang, vu nang, van nang
va cao » va cac, va co, va dao
luc va » duc va, tuc va, loc va
sach v » sach va, sach y, sach 2

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 nang xa hoi. hieu va cao luc va ((danh di) OR (xanh di)) ((cuu tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach v nang xa hoi. hieu va cao luc va ((danh di) OR (xanh di)) ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach v nang xa hoi. hieu va cao luc va ((danh di) OR (xanh di)) ((cuu tre) or (cau treo))".
• Adding a wildcard symbol may retrieve word variants: toc sach v nang xa hoi. hieu va cao luc va ((danh di) OR (xanh di)) ((cuu tre) or (cau treo))*.