Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hoc sac » hoc sach, hoc cac, hoc mac
nang xa » nang x, lang xa, nang ma
ve chat » va chat, van chat
luc van » luoc van, luu van, duc van
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
vi cua » vai cua
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 ((ve chat) or (ve cac)) luc van hanh ((vi cua) or (di cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sac ky nang xa hoi. hieu ((ve chat) OR (ve cac)) luc van hanh ((vi cua) OR (di cua)) viet.
• Adding a wildcard symbol may retrieve word variants: hoc sac ky nang xa hoi. hieu ((ve chat) or (ve cac)) luc van hanh ((vi cua) or (di cua)) viet*.