Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ban tinh » ban thanh, quan tinh, ban hanh
tu sach » thu sach, su sach, te sach
nam luc » nang luc, nhan luc, nam thuc
luc ban » duc ban, cuc ban, luc bat
y nang » ly nang, v nang, may nang
va cuu » va cau, va huu
va chu » va che, va cau, va chi

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) OR (ky nang)) xa hoi. hieu van nam luc ban tinh ((va cuu) OR (va chu)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (ky nang)) xa hoi. hieu van nam luc ban tinh ((va cuu) or (va chu)) tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (ky nang)) xa hoi. hieu van nam luc ban tinh ((va cuu) or (va chu)) tre*.