Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
vai cua » dai cua, hai cua, lai cua
hieu ve » hieu van
mai hoi » mai khoi, dai hoi, lai hoi
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: tu sach ky nang ((ma hoa) or (mai hoi)). ((hieu ve) OR (hieu va)) cam tuc va thanh vai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ma hoa) OR (mai hoi)). ((hieu ve) OR (hieu va)) cam tuc va thanh vai cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ma hoa) or (mai hoi)). ((hieu ve) OR (hieu va)) cam tuc va thanh vai cua vat".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ma hoa) or (mai hoi)). ((hieu ve) OR (hieu va)) cam tuc va thanh vai cua vat*.