Perhaps you should try some spelling variations:
dang thanh » dong thanh, dang hanh, hoang thanh
thanh tai » thanh hai, thanh toan, doanh tai
cau treo » cau theo, cau tren, cau triet
suc dang » su dang, nuoc dang, suc manh
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau tren
tu sach » thu sach, su sach, te sach
cam suc » cam xuc, cao suc, cham soc
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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 ((x hoi) or (o hoi)). hieu ve cam suc dang thanh tai ((cuu tre) OR (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((x hoi) OR (o hoi)). hieu ve cam suc dang thanh tai ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((x hoi) or (o hoi)). hieu ve cam suc dang thanh tai ((cuu tre) OR (cau treo))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((x hoi) or (o hoi)). hieu ve cam suc dang thanh tai ((cuu tre) OR (cau treo))*.