Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
qua than » qua thanh, qua phan, qua tan
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
lang xa » lang ha, dang xay
than le » thanh le, tuan le, phan le
luy tre » luyen tre
vi luy » vi lua, vi luu

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) OR (lang van)) hoi. hieu qua than 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) OR (lang van)) hoi. hieu qua than 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) OR (lang van)) hoi. hieu qua than le ((ban hanh) or (van hanh)) vi luy tre".
• Adding a wildcard symbol may retrieve word variants: tu cac ky ((lang xa) OR (lang van)) hoi. hieu qua than le ((ban hanh) or (van hanh)) vi luy tre*.