Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
vu sach » vu bach, su sach, vu khach
nang ma » tang ma, sang ma, nang cao
cam duc » cao duc, pham duc, nam duoc
cua tre » cuu tre, cua triet, dua tren
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y nang ma hoi. hieu qua ((cam duc) OR (cam xuc)) van hanh vi ((cua tre) OR (cua te))~".
• Adding a wildcard symbol may retrieve word variants: vu sach y nang ma hoi. hieu qua ((cam duc) OR (cam xuc)) van hanh vi ((cua tre) OR (cua te))*.