Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
danh dai » danh dau, danh di, danh sai
thuc va » thuc vat, thuc dan, thuc day
te sach » toc sach
tu nong » tu dong, tu cong, tu tong
tu nang » tru nang, tu nano, tu lang
van hoc » van hoa
tuc va » truc va, tuc xa, duc 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 ((tu nang) or (tu nong)) xa hoi. hieu van hoc ((tuc va) or (thuc va)) danh dai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tu nang) OR (tu nong)) xa hoi. hieu van hoc ((tuc va) OR (thuc va)) danh dai cua viet.
• Adding a wildcard symbol may retrieve word variants: te sach ((tu nang) or (tu nong)) xa hoi. hieu van hoc ((tuc va) or (thuc va)) danh dai cua viet*.