Perhaps you should try some spelling variations:
tren luyen » ren luyen, trinh luyen, tien quyen
kip tren » kip ren, kin tren, app tren
den nang » dun nang, dung nang, van nang
da nang » cam nang, kha nang, cao nang
bo vai » bo tai, bo bai, bo cai
so di » so dia, so du, so dk
bo va » bao va, do va, so va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so di) or (((bo vai) or (bo va)))) kip tren luyen ((den nang) OR (da nang)) mem. Đo tuoi 1-15~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so di) OR (((bo vai) OR (bo va)))) kip tren luyen ((den nang) OR (da nang)) mem. Đo tuoi 1-15.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so di) or (((bo vai) or (bo va)))) kip tren luyen ((den nang) OR (da nang)) mem. Đo tuoi 1-15".
• Adding a wildcard symbol may retrieve word variants: ((so di) or (((bo vai) or (bo va)))) kip tren luyen ((den nang) OR (da nang)) mem. Đo tuoi 1-15*.