Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
danh dau » lanh dao, hang dau, danh tu
dau cua » dai cua, day cua, cau cua
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
tang ma » mang may, tang van
ma hoi » mai hoi, xa hoi, ma hoa
sach 7 » sach 2
soc va » hoc va, doc va, goc va
loc va » hoc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach 7) OR (sach y)) tang ma hoi. hieu ve chat ((soc va) or (loc va)) danh dau cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach 7) OR (sach y)) tang ma hoi. hieu ve chat ((soc va) OR (loc va)) danh dau cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach 7) OR (sach y)) tang ma hoi. hieu ve chat ((soc va) or (loc va)) danh dau cua triet".
• Adding a wildcard symbol may retrieve word variants: te ((sach 7) OR (sach y)) tang ma hoi. hieu ve chat ((soc va) or (loc va)) danh dau cua triet*.