Perhaps you should try some spelling variations:
gianh lai » gian lan
va gianh » va gian, van giang, va giai
te sach » toc sach
cao duc » cao suc, giao duc, tao duoc
lai cua » dai cua, hai cua, lai chau
dao duc » giao duc, tao duoc
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ky sang » ky nang, ky dang, ky tang

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 ky sang ((le hoi) or (ma hoa)). hieu ve ((cao duc) OR (dao duc)) va gianh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky sang ((le hoi) OR (ma hoa)). hieu ve ((cao duc) OR (dao duc)) va gianh lai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky sang ((le hoi) or (ma hoa)). hieu ve ((cao duc) OR (dao duc)) va gianh lai cua tre*".