Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
cua tuc » cua tu, cua thuoc, luat tuc
luc van » luoc van, luu van, duc van
cua duc » cua nuoc, cua quoc
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
va cau » van cau, va cac, va cao
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: tu sach y nang xa hoi. hieu ((va cau) OR (va dau)) luc van hanh tai ((cua tuc) OR (cua duc))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. hieu ((va cau) or (va dau)) luc van hanh tai ((cua tuc) OR (cua duc))~".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu ((va cau) or (va dau)) luc van hanh tai ((cua tuc) OR (cua duc))*.