Perhaps you should try some spelling variations:
van nang » van quang, van dong, van dung
chat luc » chat xuc, chat lua, nhan luc
su triet » su viet, su tien, ve triet
tu cach » tu cac
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
luc van » luoc van, luu van, duc van
hanh ki » hanh vi, hanh kien, thanh kim
hanh ky » hanh kem

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

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