Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
truc may » tren may, truc va
tinh vi » trinh vi, tinh voi, tinh va
dai hoi » dai hoc, dai hai, dai moi
va cam » va cham, va cac, va cao
vi cau » va cau, ve cau, di cau
tu cam » tu cham, tu cac, tu nam
cam ky » cao ky, cac ky
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, ve cai

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 (dai hoi)). hieu ((ve cam) OR (va cam)) truc may tinh vi cau tren~.
• Adding a wildcard symbol may retrieve word variants: tu cam ky nang ((ma hoi) or (dai hoi)). hieu ((ve cam) or (va cam)) truc may tinh vi cau tren*.