Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
van hanh » van thanh, ban hanh, van anh
may thoi » gay thoi, may thi, tay thoi
cam tuc » cam tu, nam thuc, dam thuc
hieu ve » hieu va, hieu van
may hoi » tay hoi, mai hoi, may hmi
sai ky » sac ky
su sai » su tai, su hai, su dai
vi va » vi van, vai va, vu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sai ky nang ((may hoi) OR (may thoi)). hieu ve ((cam tuc) or (cam xuc)) van hanh vi va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky nang ((may hoi) OR (may thoi)). hieu ve ((cam tuc) OR (cam xuc)) van hanh vi va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky nang ((may hoi) OR (may thoi)). hieu ve ((cam tuc) or (cam xuc)) van hanh vi va trien".
• Adding a wildcard symbol may retrieve word variants: su sai ky nang ((may hoi) OR (may thoi)). hieu ve ((cam tuc) or (cam xuc)) van hanh vi va trien*.