Perhaps you should try some spelling variations:
tren luyen » ren luyen, trinh luyen, tien quyen
kip tren » kip ren, kin tren, app tren
kha nang » phap nang, ky nang, ki nang
da nang » cam nang, cao nang
de nang » den nang, ke nang, de dang
bo bai » bo ba, bo cai, co bai
tuoi 7 » tuoi 1
bao bi » bao ai, sao 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 bai) or (bo tai))) or (bao bi)) kip tren luyen ((de nang) or (((da nang) OR (kha nang)))) mem. Đo tuoi 7-15~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((bo bai) OR (bo tai))) OR (bao bi)) kip tren luyen ((de nang) OR (((da nang) OR (kha nang)))) mem. Đo tuoi 7-15.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((bo bai) or (bo tai))) or (bao bi)) kip tren luyen ((de nang) or (((da nang) OR (kha nang)))) mem. Đo tuoi 7-15".
• Adding a wildcard symbol may retrieve word variants: ((((bo bai) or (bo tai))) or (bao bi)) kip tren luyen ((de nang) or (((da nang) OR (kha nang)))) mem. Đo tuoi 7-15*.