Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
cham xuc » cam xuc, chat xuc, chao xu
hieu van » hieu va, thien van, lieu va
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang o » nang co, nang ho, nang ro
va cau » van cau, va cac, va dau
o hoi » co hoi, o hoc, o hai

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 ky nang o hoi. hieu van ((((cham xuc) OR (pham duc))) OR (cham soc)) va hanh va cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang o hoi. hieu van ((((cham xuc) OR (pham duc))) or (cham soc)) va hanh va cau tren~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang o hoi. hieu van ((((cham xuc) OR (pham duc))) or (cham soc)) va hanh va cau tren*.