Perhaps you should try some spelling variations:
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
ca tren » cau tren, cu tren, la tren
tu cam » tu cham, tu cac, tu nam
cam ky » cao ky, cac ky
ma hoi » xa hoi, ma hoa, me hoi
ve cac » va cac, vien cac
cac tu » cac thu, cach tu, cac du
vi ca » vit ca, li ca, va ca

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 cam ky nang ((ma hoi) OR (mai hoi)). hieu ve cac tu va hanh vi ca tren~.
• Adding a wildcard symbol may retrieve word variants: tu cam ky nang ((ma hoi) or (mai hoi)). hieu ve cac tu va hanh vi ca tren*.