Perhaps you should try some spelling variations:
tren luyen » trinh luyen, tien quyen, tre tuyen
luyen ky » truyen ky, luyen de
kin tren » dinh tren, gian tren, sinh tren
ky dang » ky danh
ky sang » ky tang, duy sang
nang ma » tang ma, sang ma, nang cao
tuoi 7 » tuoi 1
bi kin » bai kinh
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: (( (bot OR both) bi kin tren luyen ky nang ma. Đo tuoi 7-15 ) or ( bo bi kip ren luyen ((ky sang) or (ky dang)) ma. Đo tuoi 7-15 ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( (bot OR both) bi kin tren luyen ky nang ma. Đo tuoi 7-15 ) OR ( bo bi kip ren luyen ((ky sang) OR (ky dang)) ma. Đo tuoi 7-15 )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( (bot OR both) bi kin tren luyen ky nang ma. Đo tuoi 7-15 ) or ( bo bi kip ren luyen ((ky sang) or (ky dang)) ma. Đo tuoi 7-15 ))".
• Adding a wildcard symbol may retrieve word variants: (( (bot OR both) bi kin tren luyen ky nang ma. Đo tuoi 7-15 ) or ( bo bi kip ren luyen ((ky sang) or (ky dang)) ma. Đo tuoi 7-15 ))*.