Perhaps you should try some spelling variations:
te sach » toc sach
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
sach ty » sach y, sach tu, sach thu
cao tuc » dao tuc, cao duc, cao suc
hieu va » lieu va, hieu qua
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao
co hoi » co hoc, co loi
vi cua » vai cua, di cua

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 ty nang ((xa hoi) or (co hoi)). hieu va cao tuc ((va hanh) OR (va danh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ((xa hoi) OR (co hoi)). hieu va cao tuc ((va hanh) OR (va danh)) vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang ((xa hoi) or (co hoi)). hieu va cao tuc ((va hanh) OR (va danh)) vi cua tre*".