Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ta danh » tac danh, tao danh, tap danh
hieu va » lieu va, hieu qua
thi toc » thi tac, thi goc, thi loc
va thi » van thi, vu thi, ha thi
toc ta » toc tay, toc thai
vi cau » ve cau, di cau, viet cau
va cau » van cau, va cac, va dau
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: ((te sach) OR (toc sach)) ky nang x hoi. hieu va thi toc ta danh ((vi cau) or (va cau)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky nang x hoi. hieu va thi toc ta danh ((vi cau) OR (va cau)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ky nang x hoi. hieu va thi toc ta danh ((vi cau) or (va cau)) triet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ky nang x hoi. hieu va thi toc ta danh ((vi cau) or (va cau)) triet*.