Perhaps you should try some spelling variations:
tren luyen » ren luyen, trinh luyen, tre tuyen
tien quyen » vien huyen, vien tuyen
kip tren » kip ren, kin tren, app tren
luyen de » chuyen de
dun nang » dung nang, den nang, luan nang
nang mem » nang ma
luyen ky » truyen ky
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) OR (tien quyen)) dun nang mem. Đo tuoi 7-15 ) or ( bo bi kip tren ((luyen ky) or (luyen de)) nang mem. Đo tuoi 7-15 ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( bo bi kip ((tren luyen) OR (tien quyen)) dun nang mem. Đo tuoi 7-15 ) OR ( bo bi kip tren ((luyen ky) OR (luyen de)) nang mem. Đo tuoi 7-15 )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( bo bi kip ((tren luyen) OR (tien quyen)) dun nang mem. Đo tuoi 7-15 ) or ( bo bi kip tren ((luyen ky) or (luyen de)) nang mem. Đo tuoi 7-15 ))".
• Adding a wildcard symbol may retrieve word variants: (( bo bi kip ((tren luyen) OR (tien quyen)) dun nang mem. Đo tuoi 7-15 ) or ( bo bi kip tren ((luyen ky) or (luyen de)) nang mem. Đo tuoi 7-15 ))*.