Perhaps you should try some spelling variations:
danh vai » danh sai, danh va, doanh van
tu sach » thu sach, te sach, tu cach
va danh » va dinh, va dan, va hanh
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
va cao » va co, va dao, va bao
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) OR (su sach)) ty nang ma hoa. hieu ((va cac) or (va cao)) tuc va danh vai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ty nang ma hoa. hieu ((va cac) OR (va cao)) tuc va danh vai cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ty nang ma hoa. hieu ((va cac) or (va cao)) tuc va danh vai cua vat".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ty nang ma hoa. hieu ((va cac) or (va cao)) tuc va danh vai cua vat*.