Perhaps you should try some spelling variations:
sach kem » hanh kem
dinh tri » chinh tri
sach ky » sac ky, sach ty, sach hay
hieu va » lieu va, hieu qua
cac lop » cac hop, cac loai
va dinh » van dinh, va kinh, va tinh
lop va » lap va, hop va, nop va
cua te » cua tu
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: thu ((((sach ky) OR (sach kem))) or (sach y)) nang x hoi. hieu va cac lop va dinh tri cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((((sach ky) OR (sach kem))) OR (sach y)) nang x hoi. hieu va cac lop va dinh tri cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((((sach ky) OR (sach kem))) or (sach y)) nang x hoi. hieu va cac lop va dinh tri cua te".
• Adding a wildcard symbol may retrieve word variants: thu ((((sach ky) OR (sach kem))) or (sach y)) nang x hoi. hieu va cac lop va dinh tri cua te*.