Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thai cua » than cua, tai cuc, dai cua
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
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 lang xa hoi. ((hieu va) or (hieu qua)) cam duc van hanh ((thai cua) OR (tri cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su tai ky lang xa hoi. ((hieu va) OR (hieu qua)) cam duc van hanh ((thai cua) OR (tri cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su tai ky lang xa hoi. ((hieu va) or (hieu qua)) cam duc van hanh ((thai cua) OR (tri cua)) triet".
• Adding a wildcard symbol may retrieve word variants: su tai ky lang xa hoi. ((hieu va) or (hieu qua)) cam duc van hanh ((thai cua) OR (tri cua)) triet*.