Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cau tren » cu tren, dau tren, ca tren
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
danh di » danh du, danh dien, danh gia
xanh di » vanh dai, xanh tai
cua tre » cua te, cuu tre, cua triet
v nang » va nang, vu nang, van nang
va cam » va cham, va cac, va cao
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: thuoc sach v nang xa hoi. hieu va cam luc va ((danh di) OR (xanh di)) ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach v nang xa hoi. hieu va cam luc va ((danh di) OR (xanh di)) ((cua tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach v nang xa hoi. hieu va cam luc va ((danh di) OR (xanh di)) ((cua tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach v nang xa hoi. hieu va cam luc va ((danh di) OR (xanh di)) ((cua tre) or (cau tren))*.