Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh van
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
cac dai » cac dan, cac bai, can dai
ma hoi » xa hoi, ma hoa, me hoi
dai va » mai 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 nang ((ma hoi) or (mai hoi)). lieu va cac dai va ((hanh vai) OR (hanh tai)) cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ma hoi) OR (mai hoi)). lieu va cac dai va ((hanh vai) OR (hanh tai)) cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ma hoi) or (mai hoi)). lieu va cac dai va ((hanh vai) OR (hanh tai)) cua vat".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ma hoi) or (mai hoi)). lieu va cac dai va ((hanh vai) OR (hanh tai)) cua vat*.