Perhaps you should try some spelling variations:
dinh tri » chinh tri
te sach » toc sach
ty nang » ty xang, ty hang, ly nang
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
tuc va » truc va, tuc xa, duc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((ty nang) or (ky nang)) xa hoi. hieu ve cam ((tuc va) OR (thuc va)) dinh tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty nang) OR (ky nang)) xa hoi. hieu ve cam ((tuc va) OR (thuc va)) dinh tri cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty nang) or (ky nang)) xa hoi. hieu ve cam ((tuc va) OR (thuc va)) dinh tri cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty nang) or (ky nang)) xa hoi. hieu ve cam ((tuc va) OR (thuc va)) dinh tri cua tre*.