Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
hoc sac » hoc sach, hoc cac, hoc mac
nang xa » nang x, lang xa, nang ma
vu cham » va cham, vu kham, tu cham
luc van » luoc van, luu van, duc van
hanh di » hanh vi, hanh de, hang di
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sac ky nang xa hoi. hieu ((vu cham) or (ve cac)) luc van hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sac ky nang xa hoi. hieu ((vu cham) OR (ve cac)) luc van hanh di cua viet.
• Adding a wildcard symbol may retrieve word variants: hoc sac ky nang xa hoi. hieu ((vu cham) or (ve cac)) luc van hanh di cua viet*.