Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hanh di » hanh vi, hanh de, hang di
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
cam ky » cao ky, cac ky
ma hoi » xa hoi, ma hoa, me hoi
di cau » da cau, diem cau
tu cam » tu cham, tu cac, tu nam

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 cham ((duc va) OR (tuc xa)) hanh di cau tren~.
• Adding a wildcard symbol may retrieve word variants: tu cam ky nang ((ma hoi) or (mai hoi)). hieu ve cham ((duc va) or (tuc xa)) hanh di cau tren*.