Perhaps you should try some spelling variations:
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
cao duc » cao suc, giao duc, tao duoc
dao duc » giao duc, tao duoc
han tai » hang tai, nhan tai, van tai
va han » va phan, van han, va hanh
cuc te » cua te, cuc thue, cuc tieu
x hoi » o hoi, x ho, 5 hoi

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 ((x hoi) OR (xa hoi)). hieu va ((cao duc) or (dao duc)) va han tai cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ((x hoi) OR (xa hoi)). hieu va ((cao duc) OR (dao duc)) va han tai cuc te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang ((x hoi) OR (xa hoi)). hieu va ((cao duc) or (dao duc)) va han tai cuc te".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ((x hoi) OR (xa hoi)). hieu va ((cao duc) or (dao duc)) va han tai cuc te*.