Perhaps you should try some spelling variations:
vay doanh » van doanh, ly doanh, voi doanh
van tham » van thanh, van tuan, van chat
va doanh » van doanh, va danh, hoa doanh
cao tren » ca tren, cau tren, co tren
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
va tham » va cham, va thanh, va thuat
tai cao » thai cao, tao cao, tai sao
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky lang xa hoi. hieu ((va tham) or (van tham)) duc ((va doanh) OR (vay doanh)) tai cao tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky lang xa hoi. hieu ((va tham) OR (van tham)) duc ((va doanh) OR (vay doanh)) tai cao tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky lang xa hoi. hieu ((va tham) or (van tham)) duc ((va doanh) OR (vay doanh)) tai cao tren".
• Adding a wildcard symbol may retrieve word variants: te sac ky lang xa hoi. hieu ((va tham) or (van tham)) duc ((va doanh) OR (vay doanh)) tai cao tren*.