Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
cac luc » coc luc, cac nuoc, cac cuoc
vai cua » dai cua, hai cua, lai cua
cau luc » cau truc, cau phuc
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
sach 7 » sach y, sach 2
ma hoi » mai hoi, ma hoa, me hoi
7 tang » 6 tang

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 7 tang ((ma hoi) OR (xa hoi)). hieu ve ((cac luc) or (cau luc)) ban thanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach 7 tang ((ma hoi) OR (xa hoi)). hieu ve ((cac luc) OR (cau luc)) ban thanh vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach 7 tang ((ma hoi) OR (xa hoi)). hieu ve ((cac luc) or (cau luc)) ban thanh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach 7 tang ((ma hoi) OR (xa hoi)). hieu ve ((cac luc) or (cau luc)) ban thanh vai cua triet*.