Perhaps you should try some spelling variations:
thien van » thi van
thuc dan » thuc hanh, hoc dan, thuc vat
danh dai » danh dau, danh di, danh sai
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc day
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang x hoi. ((hieu ve) or (thien van)) am ((thuc va) or (thuc dan)) danh dai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. ((hieu ve) OR (thien van)) am ((thuc va) OR (thuc dan)) danh dai cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. ((hieu ve) or (thien van)) am ((thuc va) or (thuc dan)) danh dai cua viet*.