Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
va hanh » van hanh, va thanh, va danh
ky sang » ky nang, ky dang, ky tang
va dinh » van dinh, va kinh, va tinh
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
cac xuc » cam xuc, cac nuoc, chat xuc
hai su » hai vu, lai su, hai so
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ma hoi » xa hoi, ma hoa, me hoi
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky sang ((ma hoi) or (mai hoi)). hieu ve cac xuc ((va hanh) or (va dinh)) hai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky sang ((ma hoi) OR (mai hoi)). hieu ve cac xuc ((va hanh) OR (va dinh)) hai su triet.
• Adding a wildcard symbol may retrieve word variants: su sac ky sang ((ma hoi) or (mai hoi)). hieu ve cac xuc ((va hanh) or (va dinh)) hai su triet*.