Perhaps you should try some spelling variations:
sach tham » sach nha
sach van » sach han, sach va, bach van
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
dau xuc » dau xac, dau nuoc
dau xua » dau cua, dao xuan, dau luan
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach van) or (sach tham)) nang xa hoi. hieu va ((dau xuc) or (dau xua)) van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach van) OR (sach tham)) nang xa hoi. hieu va ((dau xuc) OR (dau xua)) van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach van) or (sach tham)) nang xa hoi. hieu va ((dau xuc) or (dau xua)) van hanh vi cua tre*.