Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cao hoat » cac hoat, co hoat, cao chat
danh vai » danh sai, danh va, doanh van
danh dau » lanh dao, hang dau, danh tu
sach ky » sac ky, sach y, sach ty
qua cac » cua cac
xuc va » tuc va, luc va, xac va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang cao hoat. hieu qua cac ((xuc va) OR (duc va)) ((danh vai) or (danh dau)) qua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang cao hoat. hieu qua cac ((xuc va) OR (duc va)) ((danh vai) OR (danh dau)) qua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang cao hoat. hieu qua cac ((xuc va) OR (duc va)) ((danh vai) or (danh dau)) qua su".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang cao hoat. hieu qua cac ((xuc va) OR (duc va)) ((danh vai) or (danh dau)) qua su*.