Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
van hanh » van thanh, ban hanh, van anh
luc van » luoc van, luu van, duc van
su sach » so sach, vu sach
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
ve cac » va cac, vien cac
ve cam » ve cham, va cam, ve cai
vi va » vi van, vai va, vu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ky lang) or (ky tang)) xa hoi. hieu ((ve cam) or (ve cac)) luc van hanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky lang) OR (ky tang)) xa hoi. hieu ((ve cam) OR (ve cac)) luc van hanh vi va triet.
• Adding a wildcard symbol may retrieve word variants: su sach ((ky lang) or (ky tang)) xa hoi. hieu ((ve cam) or (ve cac)) luc van hanh vi va triet*.