Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
thuc dan » thuc hanh, hoc dan, thuc vat
phuc van » thuc van, phuc va, chuc van
hanh di » hanh vi, hanh de, hang di
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
hieu ve » hieu van
di cuu » di cau, di cua, dinh cuu
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: nuoc sach ky nang x hoi. ((hieu ve) OR (hieu va)) cau ((phuc van) or (thuc dan)) hanh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc sach ky nang x hoi. ((hieu ve) OR (hieu va)) cau ((phuc van) OR (thuc dan)) hanh di cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc sach ky nang x hoi. ((hieu ve) OR (hieu va)) cau ((phuc van) or (thuc dan)) hanh di cuu tre".
• Adding a wildcard symbol may retrieve word variants: nuoc sach ky nang x hoi. ((hieu ve) OR (hieu va)) cau ((phuc van) or (thuc dan)) hanh di cuu tre*.