Perhaps you should try some spelling variations:
tang tai » hang tai, dung tai, sang tao
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
ky tang » ky nang, ky dang, kho tang
tai hoi » tai khoi, dai hoi, tai hai
cham so » ham so, cham hoi, cham vao
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky tang tai hoi. hieu van ((cham so) OR (((cham o) OR (cham soc)))) ban hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky tang tai hoi. hieu van ((cham so) or (((cham o) OR (cham soc)))) ban hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu cac ky tang tai hoi. hieu van ((cham so) or (((cham o) OR (cham soc)))) ban hanh vi cua tre*.