Perhaps you should try some spelling variations:
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
than le » thanh le, phan le, thanh de
luy tre » luyen tre
vi luy » vi lua, vi luu
tuan » quan, tran, luan

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky lang xa hoi. hieu qua ((than le) OR (tuan le)) ((ban hanh) or (van hanh)) vi luy tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky lang xa hoi. hieu qua ((than le) OR (tuan le)) ((ban hanh) OR (van hanh)) vi luy tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky lang xa hoi. hieu qua ((than le) OR (tuan le)) ((ban hanh) or (van hanh)) vi luy tre".
• Adding a wildcard symbol may retrieve word variants: tu cac ky lang xa hoi. hieu qua ((than le) OR (tuan le)) ((ban hanh) or (van hanh)) vi luy tre*.