Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
danh vai » danh sai, danh va, doanh van
vai cua » dai cua, hai cua, lai cua
ngoc va » nuoc va, ngoc ha, ngo va
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
ly hang » ly quang
ty hang » ty xang, thi hang, thu hang
goc va » hoc va, loc va, doc va
ve dat » de dat, va dat, ve dao

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 ((ty hang) OR (ly hang)) xa hoi. hieu ve dat ((ngoc va) or (goc va)) danh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty hang) OR (ly hang)) xa hoi. hieu ve dat ((ngoc va) OR (goc va)) danh vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty hang) OR (ly hang)) xa hoi. hieu ve dat ((ngoc va) or (goc va)) danh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty hang) OR (ly hang)) xa hoi. hieu ve dat ((ngoc va) or (goc va)) danh vai cua triet*.