Perhaps you should try some spelling variations:
van cham » van chat, van tham, va cham
danh dai » danh dau, danh sai, vanh dai
hieu van » hieu va, thien van, lieu va
danh di » danh du, xanh di, danh dien
tu sach » thu sach, su sach, te sach
nang xa » lang xa, nang ma, mang xa
ca viet » va viet, co viet, hoa viet
soc va » hoc va, loc va, doc va

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 y ((nang xa) OR (nang x)) hoi. hieu van cham soc va ((danh dai) or (danh di)) ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang xa) OR (nang x)) hoi. hieu van cham soc va ((danh dai) OR (danh di)) ca viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang xa) OR (nang x)) hoi. hieu van cham soc va ((danh dai) or (danh di)) ca viet*".