Perhaps you should try some spelling variations:
gianh lai » gian lan
va gianh » va gian, van giang, va giai
te sach » toc sach
lai cua » dai cua, hai cua, lai chau
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
ky sang » ky nang, ky dang, ky tang
ve cac » va cac, vien cac
me hoi » le hoi
ve cao » va cao, ve bao, ve co

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