Perhaps you should try some spelling variations:
van dung » van dong, xay dung, tin dung
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
vu sach » vu bach, su sach, vu khach
duc van » duc va, duc tan, duc manh
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao
vi su » va su, ve su, ki 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 sach ((van dung) or (van ban)) xa hoi. hieu ((ve cam) OR (va cam)) duc van hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((van dung) OR (van ban)) xa hoi. hieu ((ve cam) OR (va cam)) duc van hanh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((van dung) or (van ban)) xa hoi. hieu ((ve cam) OR (va cam)) duc van hanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: vu sach ((van dung) or (van ban)) xa hoi. hieu ((ve cam) OR (va cam)) duc van hanh vi su triet*.