Perhaps you should try some spelling variations:
nhung cau » chung cu, nhung bai, nhu cau
toc sach » hoc sach, doc sach, thuoc sach
cua viet » ca viet, hoa viet, cua vat
hang cau » hang dau, hang ca, nang cao
sach ty » sach y, sach tu, sach thu
danh te » danh tu, danh het, danh yen
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
te cua » tue cua, le cua, de cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty ((hang cau) OR (nhung cau)) hoi. hieu va cam ((tuc va) OR (duc va)) danh te cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty ((hang cau) OR (nhung cau)) hoi. hieu va cam ((tuc va) or (duc va)) danh te cua viet~".
• Adding a wildcard symbol may retrieve word variants: toc sach ty ((hang cau) OR (nhung cau)) hoi. hieu va cam ((tuc va) or (duc va)) danh te cua viet*.