Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dinh tai » dinh toai, dinh tri, dinh thi
ky danh » ky dang
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
xa dinh » xac dinh, va dinh, ba dinh
ky anh » ly anh, ty anh
va cam » va cham, va cac, va cao
cua tu » cua tuc, cua su, cua cu

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

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