Perhaps you should try some spelling variations:
thien van » thi van
tinh lai » tinh lao, tinh hai, minh lai
va tinh » may tinh
cac duc » cac du, cao duc, cac dac
van cac » van hac, van cau, van bac
tu sach » thu sach, su sach, te sach
ty hang » ly hang, thi hang, thu hang
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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 ((ty hang) OR (ty xang)) x hoi. thien van cac duc va tinh lai ((cua te) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty hang) OR (ty xang)) x hoi. thien van cac duc va tinh lai ((cua te) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty hang) OR (ty xang)) x hoi. thien van cac duc va tinh lai ((cua te) or (cua tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty hang) OR (ty xang)) x hoi. thien van cac duc va tinh lai ((cua te) or (cua tre))*.