Perhaps you should try some spelling variations:
van nang » van quang, van dong, van dung
van hanh » van thanh, ban hanh, van anh
xuc van » duc van, luc van, vuc van
hanh ki » hanh vi, hanh ky, hanh kien
su viet » so viet
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao
ki su » ky su

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu bach ((van nang) or (van ban)) xa hoi. hieu ((ve cam) OR (va cam)) xuc van hanh ki su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach ((van nang) OR (van ban)) xa hoi. hieu ((ve cam) OR (va cam)) xuc van hanh ki su viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu bach ((van nang) or (van ban)) xa hoi. hieu ((ve cam) OR (va cam)) xuc van hanh ki su viet".
• Adding a wildcard symbol may retrieve word variants: vu bach ((van nang) or (van ban)) xa hoi. hieu ((ve cam) OR (va cam)) xuc van hanh ki su viet*.