Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
trong va » trong van, trong ca, trong cac
thuc day » thuc dan, thuc vat
danh vi » hanh vi, dinh vi, danh di
thuc va » thuc vat, thuc dan
ve nham » ve nha, ve cham
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
va hoi » xa hoi, va hoc, va hoa
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: su ((sach thue) or (sach nha)) trong va hoi. hieu ve nham ((thuc va) OR (thuc day)) danh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach thue) OR (sach nha)) trong va hoi. hieu ve nham ((thuc va) OR (thuc day)) danh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach thue) or (sach nha)) trong va hoi. hieu ve nham ((thuc va) OR (thuc day)) danh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach thue) or (sach nha)) trong va hoi. hieu ve nham ((thuc va) OR (thuc day)) danh vi cua tre*.