Perhaps you should try some spelling variations:
nang mai » nang tai, lang mai, nang cai
ban hanh » ban hang
chat cuc » chat cua, chat xuc, chi cuc
hieu va » lieu va, hieu qua
cuc ban » cua ban, cac ban, cuu ban
vai cua » dai cua, hai cua, lai cua
nang ma » tang ma, sang ma, nang cao
va chat » van chat, va phat, cao chat
vi cua » di cua
tu sac » tu sach, tu cac, tu san
sac ky » cac 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: tu sac ky ((nang mai) OR (nang ma)) khoi. hieu va chat cuc ban hanh ((vi cua) or (vai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang mai) OR (nang ma)) khoi. hieu va chat cuc ban hanh ((vi cua) OR (vai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang mai) OR (nang ma)) khoi. hieu va chat cuc ban hanh ((vi cua) or (vai cua)) te".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang mai) OR (nang ma)) khoi. hieu va chat cuc ban hanh ((vi cua) or (vai cua)) te*.