Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
dinh tai » dinh toai, dinh tri, dinh thi
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
va dinh » van dinh, va kinh, va tinh
ky danh » ky dang
tai cua » thai cua, tai cuc, tri cua
ky anh » ly anh
ty anh » ly anh, thuy anh
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ((ky danh) or (((ky anh) OR (ty anh)))) xa hoi. hieu va cam tuc va dinh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ((ky danh) OR (((ky anh) OR (ty anh)))) xa hoi. hieu va cam tuc va dinh tai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ((ky danh) or (((ky anh) OR (ty anh)))) xa hoi. hieu va cam tuc va dinh tai cua te".
• Adding a wildcard symbol may retrieve word variants: doc sach ((ky danh) or (((ky anh) OR (ty anh)))) xa hoi. hieu va cam tuc va dinh tai cua te*.