Perhaps you should try some spelling variations:
gianh lai » gian lan
va gianh » va gian, van giang, va giai
sach ky » sach y, sach ty, sach kem
lai cua » dai cua, hai cua, lai chau
cao duc » dao duc, cao suc, giao duc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, me hoi
ve cao » va cao, ve bao, ve cac
sac ky » cac ky, sai ky

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