Perhaps you should try some spelling variations:
trinh luyen » trinh tuyen, trinh nguyen, trinh luan
app trinh » lap trinh, anh trinh, p trinh
app tren » lap tren, lop tren, tap tren
luyen ky » truyen ky, luyen de
nang ma » tang ma, sang ma, nang cao
bi app » mobi app
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 app trinh luyen ky ((nang mem) OR (nang ma)). Đo tuoi 7-15 ) or ( bo bi app tren ((truyen ke) or (truyen co)) ((nang mem) OR (nang ma)). Đo tuoi 7-15 ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( bo bi app trinh luyen ky ((nang mem) OR (nang ma)). Đo tuoi 7-15 ) OR ( bo bi app tren ((truyen ke) OR (truyen co)) ((nang mem) OR (nang ma)). Đo tuoi 7-15 )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( bo bi app trinh luyen ky ((nang mem) OR (nang ma)). Đo tuoi 7-15 ) or ( bo bi app tren ((truyen ke) or (truyen co)) ((nang mem) OR (nang ma)). Đo tuoi 7-15 ))".
• Adding a wildcard symbol may retrieve word variants: (( bo bi app trinh luyen ky ((nang mem) OR (nang ma)). Đo tuoi 7-15 ) or ( bo bi app tren ((truyen ke) or (truyen co)) ((nang mem) OR (nang ma)). Đo tuoi 7-15 ))*.