Perhaps you should try some spelling variations:
nang ban » hang ban, nang quan, nang sang
than cua » nhan cua, thai cua, gian cua
nang cap » nang cao, nang cham, nang phap
cam tuc » cam xuc, cam tu, nam thuc
ban cua » ban quan
va hanh » van hanh, va thanh, va danh
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa

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

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