Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
danh tai » doanh tai, dinh tai, hanh tai
ky danh » ky dang
tai cua » thai cua, tai cuc, tri cua
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, duc va
ky anh » ly anh, ty anh
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: toc sach ((ky danh) or (ky anh)) xa hoi. hieu va cam ((tuc va) OR (tuc xa)) danh tai cua te~.
• 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 va) OR (tuc xa)) danh tai cua te.
• 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 va) OR (tuc xa)) danh tai cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky danh) or (ky anh)) xa hoi. hieu va cam ((tuc va) OR (tuc xa)) danh tai cua te*.