Perhaps you should try some spelling variations:
tren luyen » ren luyen, trinh luyen, tien quyen
kin tren » dinh tren, gian tren, sinh tren
luyen ky » truyen ky, luyen de
nang mem » nang ma
gi tren » gai tren, gian tren, ngoi tren
bao bi » bao ai, sao bi
tuoi 7 » tuoi 1
bo bi » bo bai, bot bi, so 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) OR (bao bi)) gi tren luyen ky nang mem. Đo tuoi 7-15 ) or ( ((bo bi) OR (bao bi)) kin tren luyen ky nang mem. Đo tuoi 7-15 ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((bo bi) OR (bao bi)) gi tren luyen ky nang mem. Đo tuoi 7-15 ) OR ( ((bo bi) OR (bao bi)) kin tren luyen ky nang mem. Đo tuoi 7-15 )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((bo bi) OR (bao bi)) gi tren luyen ky nang mem. Đo tuoi 7-15 ) or ( ((bo bi) OR (bao bi)) kin tren luyen ky nang mem. Đo tuoi 7-15 ))".
• Adding a wildcard symbol may retrieve word variants: (( ((bo bi) OR (bao bi)) gi tren luyen ky nang mem. Đo tuoi 7-15 ) or ( ((bo bi) OR (bao bi)) kin tren luyen ky nang mem. Đo tuoi 7-15 ))*.