Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
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
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
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 v nang xa hoi. hieu va ((dau xuc) OR (dau xua)) van hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v 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 v nang xa hoi. hieu va ((dau xuc) OR (dau xua)) van hanh vi cua tre*.