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
cam luc » cam xuc, cau luc
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
lai hoi » dai hoi, lai hoa, lai roi
mai hoi » mai khoi, dai hoi, mai doi
ky sang » ky nang, ky dang, ky tang
vai cua » dai cua, hai cua, lai cua
luc va » duc va, tuc va, loc va

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 sang ((mai hoi) OR (lai hoi)). ((hieu ve) or (hieu va)) cam luc va thanh vai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang ((mai hoi) OR (lai hoi)). ((hieu ve) OR (hieu va)) cam luc va thanh vai cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky sang ((mai hoi) OR (lai hoi)). ((hieu ve) or (hieu va)) cam luc va thanh vai cua vat".
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang ((mai hoi) OR (lai hoi)). ((hieu ve) or (hieu va)) cam luc va thanh vai cua vat*.