Perhaps you should try some spelling variations:
van nang » van quang, van dong, van dung
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
xuc van » duc van, luc van, xuc ban
ve cam » ve cham, ve cac, va cam
vi su » va su, ki su, oi su
ve su » va su

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 ((van nang) or (van ban)) xa hoi. hieu ve cam xuc van hanh ((vi su) OR (ve su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((van nang) OR (van ban)) xa hoi. hieu ve cam xuc van hanh ((vi su) OR (ve su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((van nang) or (van ban)) xa hoi. hieu ve cam xuc van hanh ((vi su) OR (ve su)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((van nang) or (van ban)) xa hoi. hieu ve cam xuc van hanh ((vi su) OR (ve su)) triet*.