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
y nang » ky nang, ly nang, v nang
di cua » doi cua, de cua, do cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu va ((dau xuc) OR (dau xua)) van hanh ((di cua) OR (dai cua)) te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. hieu va ((dau xuc) or (dau xua)) van hanh ((di cua) OR (dai cua)) te~".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu va ((dau xuc) or (dau xua)) van hanh ((di cua) OR (dai cua)) te*.