Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
danh dau » lanh dao, hang dau, danh tu
danh dai » danh di, danh sai, vanh dai
tu sach » thu sach, su sach, te sach
cau luc » cau truc, cau phuc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
va cau » van cau, va cac, va dau
luc va » duc va, tuc va, loc va
cua tu » cua tuc, cua su, cua cu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky nang xa hoi. hieu va cau luc va ((danh dai) OR (danh dau)) cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (toc sach)) ky nang xa hoi. hieu va cau luc va ((danh dai) OR (danh dau)) cua tu~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ky nang xa hoi. hieu va cau luc va ((danh dai) OR (danh dau)) cua tu*.