Perhaps you should try some spelling variations:
cua quoc » cua nuoc, cua thuoc
nhan tai » hang tai, van tai, toan tai
ban nhan » ban than, van nhan, ban thanh
cua duc » cua tuc, cua nuoc
luc ban » duc ban, cuc ban, luc bat
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
sach v » sach va, sach y, sach 2
va cau » van cau, va cac, va cao
v nang » va nang, vu nang, van nang
va dau » va dao

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: su sach v nang xa hoi. hieu ((va cau) OR (va dau)) luc ban nhan tai ((cua duc) OR (cua quoc))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v nang xa hoi. hieu ((va cau) or (va dau)) luc ban nhan tai ((cua duc) OR (cua quoc))~".
• Adding a wildcard symbol may retrieve word variants: su sach v nang xa hoi. hieu ((va cau) or (va dau)) luc ban nhan tai ((cua duc) OR (cua quoc))*.