Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
va tinh » may tinh
cam luc » cam xuc, cau luc
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
va cam » va cham, va cac, va cao
ban ky » van ky, dan ky
luc va » duc va, tuc va, loc va
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac
tu ban » thu ban, te ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ban ky tang ma hoi. hieu va cam luc va tinh ((ve cac) or (vien cac)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ban ky tang ma hoi. hieu va cam luc va tinh ((ve cac) OR (vien cac)) tren.
• Adding a wildcard symbol may retrieve word variants: tu ban ky tang ma hoi. hieu va cam luc va tinh ((ve cac) or (vien cac)) tren*.