Perhaps you should try some spelling variations:
van nhanh » van thanh, van hanh, van khanh
nhanh thi » nhanh thai, nhanh thuc, nhan tai
va triet » va thiet, va trien, ve triet
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
cam duc » cam xuc, cao duc, nam duoc
su tai » su thi, tu tai
tai ky » thai ky, trai 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: su tai ky tang xa hoi. hieu ve ((cam duc) or (pham duc)) van nhanh thi ((cua tre) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su tai ky tang xa hoi. hieu ve ((cam duc) OR (pham duc)) van nhanh thi ((cua tre) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: su tai ky tang xa hoi. hieu ve ((cam duc) or (pham duc)) van nhanh thi ((cua tre) or (va triet))*.