Perhaps you should try some spelling variations:
nhung cau » chung cu, nhung bai, nhu cau
hang cau » hang dau, hang ca, nang cao
cua viet » ca viet, hoa viet, cua vat
te sach » toc sach
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
danh vi » hanh vi, dinh vi, danh di
va cam » va cham, va cac, va cao
xuc va » tuc va, luc va, xac va
vi cua » vai cua, di cua

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 ty ((hang cau) or (nhung cau)) hoi. hieu va cam ((xuc va) or (duc va)) danh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((hang cau) OR (nhung cau)) hoi. hieu va cam ((xuc va) OR (duc va)) danh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: te sach ty ((hang cau) or (nhung cau)) hoi. hieu va cam ((xuc va) or (duc va)) danh vi cua viet*.