Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
tru nang » tra nang, tri nang, truc nano
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
tu nang » tu nong, tu nano, tu lang
van cam » van nam, van lam, van cau
xuc van » duc van, luc van, vuc van
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren

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: thu sach ((tu nang) OR (tru nang)) xa hoi. hieu van cam xuc van hanh vi ((cuu tre) OR (cua tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((tu nang) or (tru nang)) xa hoi. hieu van cam xuc van hanh vi ((cuu tre) OR (cua tre))~".
• Adding a wildcard symbol may retrieve word variants: thu sach ((tu nang) or (tru nang)) xa hoi. hieu van cam xuc van hanh vi ((cuu tre) OR (cua tre))*.