Perhaps you should try some spelling variations:
dinh tri » chinh tri
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
dinh vi » dinh ve, dinh viet, dinh thi
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
va cam » va cham, va cao, va cai
tuc va » thuc va, truc va, tuc xa

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 y nang xa hoi. hieu ((va cam) or (va cac)) tuc va ((dinh vi) OR (dinh tri)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu ((va cam) OR (va cac)) tuc va ((dinh vi) OR (dinh tri)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. hieu ((va cam) or (va cac)) tuc va ((dinh vi) OR (dinh tri)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu ((va cam) or (va cac)) tuc va ((dinh vi) OR (dinh tri)) cua tre*.