Perhaps you should try some spelling variations:
nang cai » nang cao, nang tai, nang can
nhan cua » nhat cua, nhan luc, nhan su
than cua » thai cua, ban cua, gian cua
nang cap » nang cao, nang cham, nang phap
va hanh » van hanh, va thanh, va danh
bach ky » bac ky
cam luc » cam xuc, cau luc
hieu va » lieu va, hieu qua
luc va » duc va, tuc va, loc va
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu bach ky ((nang cai) or (nang cap)) hoi. hieu va cam luc va hanh ((than cua) OR (nhan cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach ky ((nang cai) OR (nang cap)) hoi. hieu va cam luc va hanh ((than cua) OR (nhan cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu bach ky ((nang cai) or (nang cap)) hoi. hieu va cam luc va hanh ((than cua) OR (nhan cua)) triet".
• Adding a wildcard symbol may retrieve word variants: vu bach ky ((nang cai) or (nang cap)) hoi. hieu va cam luc va hanh ((than cua) OR (nhan cua)) triet*.