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
te sach » toc sach
ve chat » va chat, van chat
sach 7 » sach y, sach 2
soc va » hoc va, doc va, goc va
loc va » hoc va, luc va
ma hoi » mai hoi, xa hoi, 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: te sach 7 tang ((ma hoi) OR (ma hoa)). 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 tang ((ma hoi) OR (ma hoa)). 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 tang ((ma hoi) OR (ma hoa)). hieu ve chat ((soc va) or (loc va)) danh dau cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach 7 tang ((ma hoi) OR (ma hoa)). hieu ve chat ((soc va) or (loc va)) danh dau cua triet*.