Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dua tren » dung tren
sach va » sach xa, sach ha, sach dao
hanh de » hanh ve, hanh kem
hanh di » hanh vi, hang di, danh di
cao xuc » cam xuc, cao duc, cao suc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
va nang » van nang, da nang, cam nang
xuc va » duc va, tuc va, luc va
va cao » va cac, va co, va dao
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 va nang xa hoi. hieu va cao xuc va ((hanh di) or (hanh de)) ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach va nang xa hoi. hieu va cao xuc va ((hanh di) OR (hanh de)) ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: toc sach va nang xa hoi. hieu va cao xuc va ((hanh di) or (hanh de)) ((dua tren) or (cua te))*.