Perhaps you should try some spelling variations:
hanh than » hanh han, hanh nhan, hanh phan
van hanh » van thanh, ban hanh, van anh
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
cua tre » cuu tre, cua triet, dua tren
cam duc » cam xuc, pham duc, nam duoc
cao duc » dao duc, cao suc, giao duc
su sai » su tai, su hai, su dai
cua te » cua tu
sai ky » sac ky
ma hoi » mai hoi, xa hoi, ma hoa

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 tang ma hoi. hieu qua ((cam duc) or (cao duc)) van hanh than ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky tang ma hoi. hieu qua ((cam duc) OR (cao duc)) van hanh than ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: su sai ky tang ma hoi. hieu qua ((cam duc) or (cao duc)) van hanh than ((cua tre) or (cua te))*.