Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cac cuoc » cac nuoc, ca cuoc, cac quoc
tu cach » tu cac
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (tu sach)) ky lang xa hoi. hieu ve ((cac cuoc) or (cam xuc)) van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (tu sach)) ky lang xa hoi. hieu ve ((cac cuoc) OR (cam xuc)) van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (tu sach)) ky lang xa hoi. hieu ve ((cac cuoc) or (cam xuc)) van hanh vi cua tre*.