Perhaps you should try some spelling variations:
van lang » van nang, va lang, van dang
van hang » van khang, van hoang, van thang
cham luc » cham soc, nhan luc, cham cuu
van hanh » van thanh, ban hanh, van anh
su triet » su tien, ve triet
tu bach » vu bach, tu cach, tu bac
va cham » va chat, va tham
luc van » luoc van, luu van, duc van
su viet » so viet

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu bach ((van lang) OR (van hang)) xa hoi. lieu va cham luc van hanh vi ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bach ((van lang) OR (van hang)) xa hoi. lieu va cham luc van hanh vi ((su triet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu bach ((van lang) OR (van hang)) xa hoi. lieu va cham luc van hanh vi ((su triet) or (su viet))".
• Adding a wildcard symbol may retrieve word variants: tu bach ((van lang) OR (van hang)) xa hoi. lieu va cham luc van hanh vi ((su triet) or (su viet))*.