Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
danh dau » lanh dao, hang dau, danh tu
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
mai hoi » mai khoi, dai hoi, lai hoi
dau cua » dai cua, day cua, cau cua
te sach » toc sach
y tang » ky tang, 6 tang, 7 tang
ma hoi » xa hoi, ma hoa, me hoi
luc va » duc va, tuc va
loc va » hoc 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 y tang ((ma hoi) OR (mai hoi)). hieu van cham ((luc va) or (loc va)) danh dau cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y tang ((ma hoi) OR (mai hoi)). hieu van cham ((luc va) OR (loc va)) danh dau cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y tang ((ma hoi) OR (mai hoi)). hieu van cham ((luc va) or (loc va)) danh dau cua viet".
• Adding a wildcard symbol may retrieve word variants: te sach y tang ((ma hoi) OR (mai hoi)). hieu van cham ((luc va) or (loc va)) danh dau cua viet*.