Perhaps you should try some spelling variations:
tinh viet » trinh viet, ninh viet, dinh viet
hieu van » hieu va, thien van, lieu va
te sach » toc sach
cua tre » cua te, cua triet, dua tren
va tinh » may tinh
van cac » van hac, van cau, van bac
sach ty » sach y, sach tu, sach thu
cuu tre » cau tren, cau treo
dan va » doan va, dan ca, ban va
ma hoi » mai hoi, xa hoi, me hoi

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 ((ma hoi) OR (ma hoa)). hieu van cac dan va tinh viet ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty xang ((ma hoi) OR (ma hoa)). hieu van cac dan va tinh viet ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty xang ((ma hoi) OR (ma hoa)). hieu van cac dan va tinh viet ((cua tre) or (cuu tre))*".