Perhaps you should try some spelling variations:
tren luyen » ren luyen, trinh luyen, tien quyen
luyen den » luyen de, huyen dien, luyen vien
kip tren » kip ren, kin tren, app tren
den nang » dun nang, dung nang, da nang
nang mem » nang ma
luyen ke » luyen de, luyen ky, luyen le
ke nang » ky nang, ki nang, ke mang
tuoi 7 » tuoi 1
bo bi » bao bi, bo bai, bot bi

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( bo bi kip tren luyen den nang mem. Đo tuoi 7-15 ) or ( bo bi kip tren luyen ke nang mem. Đo tuoi 7-15 ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( bo bi kip tren luyen den nang mem. Đo tuoi 7-15 ) OR ( bo bi kip tren luyen ke nang mem. Đo tuoi 7-15 )).
• Adding a wildcard symbol may retrieve word variants: (( bo bi kip tren luyen den nang mem. Đo tuoi 7-15 ) or ( bo bi kip tren luyen ke nang mem. Đo tuoi 7-15 ))*.