Perhaps you should try some spelling variations:
trinh viet » ninh viet, trinh vat
dinh viet » ninh viet, danh viet, sinh vien
hieu van » hieu va, thien van, lieu va
te sach » toc sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va
xang xa » lang xa, mang xa, ang xa
cuu tre » cua tre, cau tren, cau treo
dan va » doan va, dan ca, ban 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 xang xa hoi. ((hieu ve) OR (hieu van)) cac dan va ((dinh viet) or (trinh viet)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty xang xa hoi. ((hieu ve) OR (hieu van)) cac dan va ((dinh viet) OR (trinh viet)) cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty xang xa hoi. ((hieu ve) OR (hieu van)) cac dan va ((dinh viet) or (trinh viet)) cuu tre*".