Perhaps you should try some spelling variations:
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
danh dai » danh dau, danh di, vanh dai
danh sai » dung sai, danh bat, danh dau
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
x hoi » xa hoi, o hoi, x ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu va cac nuoc va ((danh dai) OR (danh sai)) cau tren~.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu va cac nuoc va ((danh dai) or (danh sai)) cau tren*.