Perhaps you should try some spelling variations:
dinh viet » ninh viet, danh viet, trinh viet
viet cua » viec cua, viet ca, viet qua
hoc anh » hoc nganh, hoc nhanh, ngoc anh
xang xa » lang xa, mang xa, ang xa
hieu ve » hieu van
hieu va » lieu va, hieu qua
cac duc » cac du, cac dac, cac nuoc
cao duc » dao duc, cao suc, giao duc
va dinh » van dinh, va kinh, va tinh
cua tre » cua te, cuu tre, cua triet
anh ty » anh tuy, anh tu, anh ta

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc anh ty xang xa hoi. ((hieu ve) or (hieu va)) ((cac duc) OR (cao duc)) va dinh viet cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc anh ty xang xa hoi. ((hieu ve) OR (hieu va)) ((cac duc) OR (cao duc)) va dinh viet cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc anh ty xang xa hoi. ((hieu ve) or (hieu va)) ((cac duc) OR (cao duc)) va dinh viet cua tre*".