Perhaps you should try some spelling variations:
ban hanh » ban hang
dua tren » dung tren
ve cham » va cham, ve chat, vu cham
luc ban » duc ban, cuc ban, luc bat
hanh va » hang va, hanh vi
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ve cam » ve cac, va cam, ve cai
va dua » va du, va da, va dia
x hoi » xa hoi, o hoi, 5 hoi

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

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