Perhaps you should try some spelling variations:
gianh lai » gian lan
sang mai » sang ma, sang tai, lang mai
mai khoi » mai khoa, tai khoa, cac khoi
danh lai » danh sai, dinh lam, hanh lam
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ky sang » ky nang, ky dang, ky tang
te cac » tu cac, ve cac, te cao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te cac ky sang mai khoi. hieu ve ((giao duc) or (cam xuc)) va ((danh lai) OR (gianh lai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ky sang mai khoi. hieu ve ((giao duc) OR (cam xuc)) va ((danh lai) OR (gianh lai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cac ky sang mai khoi. hieu ve ((giao duc) or (cam xuc)) va ((danh lai) OR (gianh lai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te cac ky sang mai khoi. hieu ve ((giao duc) or (cam xuc)) va ((danh lai) OR (gianh lai)) cua tre*.